diff --git a/gtk/util.c b/gtk/util.c
index 42c97602b..1efc8064c 100644
--- a/gtk/util.c
+++ b/gtk/util.c
@@ -583,19 +583,6 @@ void gtr_dialog_set_content(GtkDialog* dialog, GtkWidget* content)
 ****
 ***/
 
-void gtr_http_failure_dialog(GtkWidget* parent, char const* url, long response_code)
-{
-    GtkWindow* window = getWindow(parent);
-
-    GtkWidget* w = gtk_message_dialog_new(window, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, _("Error opening \"%s\""), url);
-
-    gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(w), _("Server returned \"%1$ld %2$s\""), response_code,
-        tr_webGetResponseStr(response_code));
-
-    g_signal_connect_swapped(w, "response", G_CALLBACK(gtk_widget_destroy), w);
-    gtk_widget_show(w);
-}
-
 void gtr_unrecognized_url_dialog(GtkWidget* parent, char const* url)
 {
     char const* xt = "xt=urn:btih";
diff --git a/gtk/util.h b/gtk/util.h
index ba0383a63..55f3c0df9 100644
--- a/gtk/util.h
+++ b/gtk/util.h
@@ -133,8 +133,6 @@ void gtr_freespace_label_set_dir(GtkWidget* label, char const* dir);
 
 void gtr_unrecognized_url_dialog(GtkWidget* parent, char const* url);
 
-void gtr_http_failure_dialog(GtkWidget* parent, char const* url, long response_code);
-
 void gtr_add_torrent_error_dialog(GtkWidget* window_or_child, int err, tr_torrent* duplicate_torrent, char const* filename);
 
 /* pop up the context menu if a user right-clicks.
diff --git a/libtransmission/announcer.c b/libtransmission/announcer.c
index f02b56962..1df0299f4 100644
--- a/libtransmission/announcer.c
+++ b/libtransmission/announcer.c
@@ -204,11 +204,6 @@ static struct tr_scrape_info* tr_announcerGetScrapeInfo(struct tr_announcer* ann
     return info;
 }
 
-bool tr_announcerHasBacklog(struct tr_announcer const* announcer)
-{
-    return announcer->slotsAvailable < 1;
-}
-
 static void onUpkeepTimer(evutil_socket_t foo UNUSED, short bar UNUSED, void* vannouncer);
 
 void tr_announcerInit(tr_session* session)
diff --git a/libtransmission/announcer.h b/libtransmission/announcer.h
index 4df805663..72a69b86d 100644
--- a/libtransmission/announcer.h
+++ b/libtransmission/announcer.h
@@ -67,8 +67,6 @@ void tr_announcerClose(tr_session*);
 
 struct tr_torrent_tiers* tr_announcerAddTorrent(tr_torrent* torrent, tr_tracker_callback cb, void* cbdata);
 
-bool tr_announcerHasBacklog(struct tr_announcer const*);
-
 void tr_announcerResetTorrent(struct tr_announcer*, tr_torrent*);
 
 void tr_announcerRemoveTorrent(struct tr_announcer*, tr_torrent*);
diff --git a/libtransmission/error.c b/libtransmission/error.c
index 4331a985d..c28abe0f3 100644
--- a/libtransmission/error.c
+++ b/libtransmission/error.c
@@ -11,20 +11,6 @@
 #include "tr-assert.h"
 #include "utils.h"
 
-tr_error* tr_error_new(int code, char const* message_format, ...)
-{
-    TR_ASSERT(message_format != NULL);
-
-    tr_error* error;
-    va_list args;
-
-    va_start(args, message_format);
-    error = tr_error_new_valist(code, message_format, args);
-    va_end(args);
-
-    return error;
-}
-
 tr_error* tr_error_new_literal(int code, char const* message)
 {
     TR_ASSERT(message != NULL);
diff --git a/libtransmission/error.h b/libtransmission/error.h
index 5a8b3dbdf..0e96f06bc 100644
--- a/libtransmission/error.h
+++ b/libtransmission/error.h
@@ -32,17 +32,6 @@ typedef struct tr_error
 }
 tr_error;
 
-/**
- * @brief Create new error object using `printf`-style formatting.
- *
- * @param[in] code           Error code (platform-specific).
- * @param[in] message_format Error message format string.
- * @param[in] ...            Format arguments.
- *
- * @return Newly allocated error object on success, `NULL` otherwise.
- */
-tr_error* tr_error_new(int code, char const* message_format, ...) TR_GNUC_PRINTF(2, 3);
-
 /**
  * @brief Create new error object using literal error message.
  *
diff --git a/libtransmission/handshake.c b/libtransmission/handshake.c
index c1c4654c8..bab0e2d28 100644
--- a/libtransmission/handshake.c
+++ b/libtransmission/handshake.c
@@ -81,12 +81,6 @@ enum
 #define HANDSHAKE_SET_DHT(bits) ((void)0)
 #endif
 
-/* http://www.azureuswiki.com/index.php/Extension_negotiation_protocol
-   these macros are to be used if both extended messaging and the
-   azureus protocol is supported, they indicate which protocol is preferred */
-#define HANDSHAKE_GET_EXTPREF(reserved) ((reserved)[5] & 0x03)
-#define HANDSHAKE_SET_EXTPREF(reserved, val) ((reserved)[5] |= 0x03 & (val))
-
 /**
 ***
 **/
@@ -1252,14 +1246,6 @@ tr_handshake* tr_handshakeNew(tr_peerIo* io, tr_encryption_mode encryptionMode,
     return handshake;
 }
 
-struct tr_peerIo* tr_handshakeGetIO(tr_handshake* handshake)
-{
-    TR_ASSERT(handshake != NULL);
-    TR_ASSERT(handshake->io != NULL);
-
-    return handshake->io;
-}
-
 struct tr_peerIo* tr_handshakeStealIO(tr_handshake* handshake)
 {
     TR_ASSERT(handshake != NULL);
diff --git a/libtransmission/handshake.h b/libtransmission/handshake.h
index 593e3c489..5a2aef601 100644
--- a/libtransmission/handshake.h
+++ b/libtransmission/handshake.h
@@ -36,8 +36,6 @@ tr_address const* tr_handshakeGetAddr(struct tr_handshake const* handshake, tr_p
 
 void tr_handshakeAbort(tr_handshake* handshake);
 
-struct tr_peerIo* tr_handshakeGetIO(tr_handshake* handshake);
-
 struct tr_peerIo* tr_handshakeStealIO(tr_handshake* handshake);
 
 /** @} */
diff --git a/libtransmission/peer-mgr.c b/libtransmission/peer-mgr.c
index b617ecf5d..d1239cc16 100644
--- a/libtransmission/peer-mgr.c
+++ b/libtransmission/peer-mgr.c
@@ -2204,19 +2204,6 @@ void tr_peerMgrAddPex(tr_torrent* tor, uint8_t from, tr_pex const* pex, int8_t s
     }
 }
 
-void tr_peerMgrMarkAllAsSeeds(tr_torrent* tor)
-{
-    tr_swarm* s = tor->swarm;
-    int const n = tr_ptrArraySize(&s->pool);
-    struct peer_atom** it = (struct peer_atom**)tr_ptrArrayBase(&s->pool);
-    struct peer_atom** end = it + n;
-
-    while (it != end)
-    {
-        atomSetSeed(s, *it++);
-    }
-}
-
 tr_pex* tr_peerMgrCompactToPex(void const* compact, size_t compactLen, uint8_t const* added_f, size_t added_f_len,
     size_t* pexCount)
 {
@@ -2267,24 +2254,6 @@ tr_pex* tr_peerMgrCompact6ToPex(void const* compact, size_t compactLen, uint8_t
     return pex;
 }
 
-tr_pex* tr_peerMgrArrayToPex(void const* array, size_t arrayLen, size_t* pexCount)
-{
-    size_t n = arrayLen / (sizeof(tr_address) + 2);
-    uint8_t const* walk = array;
-    tr_pex* pex = tr_new0(tr_pex, n);
-
-    for (size_t i = 0; i < n; ++i)
-    {
-        memcpy(&pex[i].addr, walk, sizeof(tr_address));
-        memcpy(&pex[i].port, walk + sizeof(tr_address), 2);
-        pex[i].flags = 0x00;
-        walk += sizeof(tr_address) + 2;
-    }
-
-    *pexCount = n;
-    return pex;
-}
-
 /**
 ***
 **/
diff --git a/libtransmission/peer-mgr.h b/libtransmission/peer-mgr.h
index 5191e966d..2dd414a97 100644
--- a/libtransmission/peer-mgr.h
+++ b/libtransmission/peer-mgr.h
@@ -95,15 +95,11 @@ tr_pex* tr_peerMgrCompactToPex(void const* compact, size_t compactLen, uint8_t c
 tr_pex* tr_peerMgrCompact6ToPex(void const* compact, size_t compactLen, uint8_t const* added_f, size_t added_f_len,
     size_t* pexCount);
 
-tr_pex* tr_peerMgrArrayToPex(void const* array, size_t arrayLen, size_t* setme_pex_count);
-
 /**
  * @param seedProbability [0..100] for likelihood that the peer is a seed; -1 for unknown
  */
 void tr_peerMgrAddPex(tr_torrent* tor, uint8_t from, tr_pex const* pex, int8_t seedProbability);
 
-void tr_peerMgrMarkAllAsSeeds(tr_torrent* tor);
-
 enum
 {
     TR_PEERS_CONNECTED,
diff --git a/libtransmission/session.c b/libtransmission/session.c
index 94faf446d..398ce7d76 100644
--- a/libtransmission/session.c
+++ b/libtransmission/session.c
@@ -1782,11 +1782,6 @@ void tr_sessionSetAltSpeedFunc(tr_session* session, tr_altSpeedFunc func, void*
     session->turtle.callbackUserData = userData;
 }
 
-void tr_sessionClearAltSpeedFunc(tr_session* session)
-{
-    tr_sessionSetAltSpeedFunc(session, NULL, NULL);
-}
-
 /***
 ****
 ***/
diff --git a/libtransmission/transmission.h b/libtransmission/transmission.h
index 33e880c0f..c34e1d6df 100644
--- a/libtransmission/transmission.h
+++ b/libtransmission/transmission.h
@@ -566,7 +566,6 @@ tr_sched_day tr_sessionGetAltSpeedDay(tr_session const*);
 
 typedef void (* tr_altSpeedFunc)(tr_session*, bool active, bool userDriven, void*);
 
-void tr_sessionClearAltSpeedFunc(tr_session*);
 void tr_sessionSetAltSpeedFunc(tr_session*, tr_altSpeedFunc, void*);
 
 bool tr_sessionGetActiveSpeedLimit_KBps(tr_session const* session, tr_direction dir, double* setme);
diff --git a/qt/FaviconCache.cc b/qt/FaviconCache.cc
index 42d7e514c..cad9c496d 100644
--- a/qt/FaviconCache.cc
+++ b/qt/FaviconCache.cc
@@ -79,11 +79,6 @@ void FaviconCache::ensureCacheDirHasBeenScanned()
 ****
 ***/
 
-QString FaviconCache::getDisplayName(QUrl const& url)
-{
-    return getDisplayName(getKey(url));
-}
-
 QString FaviconCache::getDisplayName(QString const& key)
 {
     auto name = key;
diff --git a/qt/FaviconCache.h b/qt/FaviconCache.h
index 3ce0618b5..6e3e1e4b5 100644
--- a/qt/FaviconCache.h
+++ b/qt/FaviconCache.h
@@ -36,7 +36,6 @@ public:
     // Returns the key.
     QString add(QUrl const& url);
 
-    static QString getDisplayName(QUrl const& url);
     static QString getDisplayName(QString const& key);
     static QString getKey(QUrl const& url);
     static QString getKey(QString const& displayName);
diff --git a/qt/FilterBarComboBox.cc b/qt/FilterBarComboBox.cc
index c07fa71a3..81a7a1473 100644
--- a/qt/FilterBarComboBox.cc
+++ b/qt/FilterBarComboBox.cc
@@ -30,20 +30,6 @@ FilterBarComboBox::FilterBarComboBox(QWidget* parent) :
     setSizeAdjustPolicy(QComboBox::AdjustToContents);
 }
 
-int FilterBarComboBox::currentCount() const
-{
-    int count = 0;
-
-    QModelIndex const modelIndex = model()->index(currentIndex(), 0, rootModelIndex());
-
-    if (modelIndex.isValid())
-    {
-        count = modelIndex.data(CountRole).toInt();
-    }
-
-    return count;
-}
-
 QSize FilterBarComboBox::minimumSizeHint() const
 {
     QFontMetrics fm(fontMetrics());
diff --git a/qt/FilterBarComboBox.h b/qt/FilterBarComboBox.h
index 514c2df49..f3d47dbf1 100644
--- a/qt/FilterBarComboBox.h
+++ b/qt/FilterBarComboBox.h
@@ -25,8 +25,6 @@ public:
 public:
     FilterBarComboBox(QWidget* parent = nullptr);
 
-    int currentCount() const;
-
     // QWidget
     QSize minimumSizeHint() const override;
     QSize sizeHint() const override;
diff --git a/qt/RpcQueue.cc b/qt/RpcQueue.cc
index c33f2e3af..6e4b9d1c1 100644
--- a/qt/RpcQueue.cc
+++ b/qt/RpcQueue.cc
@@ -17,11 +17,6 @@ RpcQueue::RpcQueue(QObject* parent) :
     connect(&myFutureWatcher, SIGNAL(finished()), SLOT(stepFinished()));
 }
 
-RpcResponseFuture RpcQueue::future()
-{
-    return myPromise.future();
-}
-
 void RpcQueue::stepFinished()
 {
     RpcResponse result;
diff --git a/qt/RpcQueue.h b/qt/RpcQueue.h
index 098d9f62d..6976d0459 100644
--- a/qt/RpcQueue.h
+++ b/qt/RpcQueue.h
@@ -43,8 +43,6 @@ public:
         myQueue.enqueue(qMakePair(normalizeFunc(func), normalizeErrorHandler(errorHandler)));
     }
 
-    RpcResponseFuture future();
-
     // The first function in queue is ran synchronously
     // (hence it may be e. g. a lambda capturing local variables by reference).
     void run();
diff --git a/qt/Torrent.cc b/qt/Torrent.cc
index 833485697..99c599f89 100644
--- a/qt/Torrent.cc
+++ b/qt/Torrent.cc
@@ -407,19 +407,6 @@ bool Torrent::getSeedRatio(double& ratio) const
     return isLimited;
 }
 
-bool Torrent::hasFileSubstring(QString const& substr) const
-{
-    for (TorrentFile const& file : myFiles)
-    {
-        if (file.filename.contains(substr, Qt::CaseInsensitive))
-        {
-            return true;
-        }
-    }
-
-    return false;
-}
-
 bool Torrent::hasTrackerSubstring(QString const& substr) const
 {
     for (auto const& s : trackers())
@@ -519,14 +506,6 @@ int Torrent::compareETA(Torrent const& that) const
     return 0;
 }
 
-int Torrent::compareTracker(Torrent const& that) const
-{
-    Q_UNUSED(that)
-
-    // FIXME
-    return 0;
-}
-
 /***
 ****
 ***/
diff --git a/qt/Torrent.h b/qt/Torrent.h
index cefe9ad66..a3fd39b82 100644
--- a/qt/Torrent.h
+++ b/qt/Torrent.h
@@ -342,7 +342,6 @@ public:
         return getSize(FAILED_EVER);
     }
 
-    int compareTracker(Torrent const&) const;
     int compareSeedRatio(Torrent const&) const;
     int compareRatio(Torrent const&) const;
     int compareETA(Torrent const&) const;
@@ -432,7 +431,6 @@ public:
         return getDouble(PERCENT_VERIFIED);
     }
 
-    bool hasFileSubstring(QString const& substr) const;
     bool hasTrackerSubstring(QString const& substr) const;
 
     Speed uploadLimit() const
diff --git a/qt/TorrentFilter.cc b/qt/TorrentFilter.cc
index b3a2f0389..acb54e3e3 100644
--- a/qt/TorrentFilter.cc
+++ b/qt/TorrentFilter.cc
@@ -313,11 +313,6 @@ bool TorrentFilter::filterAcceptsRow(int sourceRow, QModelIndex const& sourcePar
     return accepts;
 }
 
-int TorrentFilter::hiddenRowCount() const
-{
-    return sourceModel()->rowCount() - rowCount();
-}
-
 void TorrentFilter::countTorrentsPerMode(int* setmeCounts) const
 {
     std::fill_n(setmeCounts, static_cast<std::size_t>(FilterMode::NUM_MODES), 0);
diff --git a/qt/TorrentFilter.h b/qt/TorrentFilter.h
index b1ad4961b..5eecea466 100644
--- a/qt/TorrentFilter.h
+++ b/qt/TorrentFilter.h
@@ -33,8 +33,6 @@ public:
     TorrentFilter(Prefs const& prefs);
     virtual ~TorrentFilter();
 
-    int hiddenRowCount() const;
-
     void countTorrentsPerMode(int* setmeCounts) const;
 
 protected:
diff --git a/qt/TorrentModel.cc b/qt/TorrentModel.cc
index c01fc5472..6a3ae39f7 100644
--- a/qt/TorrentModel.cc
+++ b/qt/TorrentModel.cc
@@ -349,11 +349,6 @@ std::optional<int> TorrentModel::getRow(int id) const
     return row;
 }
 
-std::optional<int> TorrentModel::getRow(Torrent const* tor) const
-{
-    return getRow(tor->id());
-}
-
 Torrent* TorrentModel::getTorrentFromId(int id)
 {
     auto const row = getRow(id);
diff --git a/qt/TorrentModel.h b/qt/TorrentModel.h
index 1a4c57e02..d910a9240 100644
--- a/qt/TorrentModel.h
+++ b/qt/TorrentModel.h
@@ -68,7 +68,6 @@ private:
     void rowsEmitChanged(torrent_ids_t const& ids);
 
     std::optional<int> getRow(int id) const;
-    std::optional<int> getRow(Torrent const* tor) const;
     using span_t = std::pair<int, int>;
     std::vector<span_t> getSpans(torrent_ids_t const& ids) const;
 
diff --git a/qt/TrackerDelegate.cc b/qt/TrackerDelegate.cc
index 873cd8a1c..b36d72dbc 100644
--- a/qt/TrackerDelegate.cc
+++ b/qt/TrackerDelegate.cc
@@ -86,13 +86,6 @@ ItemLayout::ItemLayout(QString const& text, bool suppressColors, Qt::LayoutDirec
 
 } // namespace
 
-QSize TrackerDelegate::margin(QStyle const& style) const
-{
-    Q_UNUSED(style)
-
-    return myMargin;
-}
-
 /***
 ****
 ***/
diff --git a/qt/TrackerDelegate.h b/qt/TrackerDelegate.h
index ebdb1789e..a4ab054f0 100644
--- a/qt/TrackerDelegate.h
+++ b/qt/TrackerDelegate.h
@@ -34,7 +34,6 @@ public:
 
 protected:
     QString getText(TrackerInfo const&) const;
-    QSize margin(QStyle const& style) const;
 
     QSize sizeHint(QStyleOptionViewItem const&, TrackerInfo const&) const;
     void drawTracker(QPainter*, QStyleOptionViewItem const&, TrackerInfo const&) const;