diff --git a/pkgs/development/libraries/qt-5/5.15/default.nix b/pkgs/development/libraries/qt-5/5.15/default.nix
index 1b52f79c33c..5f829009038 100644
--- a/pkgs/development/libraries/qt-5/5.15/default.nix
+++ b/pkgs/development/libraries/qt-5/5.15/default.nix
@@ -52,6 +52,98 @@ let
       # prevent headaches from stale qmlcache data
       ./qtdeclarative-default-disable-qmlcache.patch
     ];
+    qtpim = [
+      ## Upstream patches after the Qt6 transition that apply without problems & fix bugs
+
+      # Fixes QList -> QSet conversion
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/f337e281e28904741a3b1ac23d15c3a83ef2bbc9.patch";
+        hash = "sha256-zlxD45JnbhIgdJxMmGxGMUBcQPcgzpu3s4bLX939jL0=";
+      })
+      # Fixes invalid syntax from a previous bad patch in tests
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/2aefdd8bd28a4decf9ef8381f5b255f39f1ee90c.patch";
+        hash = "sha256-mg93QF3hi50igw1/Ok7fEs9iCaN6co1+p2/5fQtxTmc=";
+      })
+      # Unit test account for QList index change
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/79b41af6a4117f5efb0298289e20c30b4d0b0b2e.patch";
+        hash = "sha256-u+cLl4lu6r2+j5GAiasqbB6/OZPz5A6GpSB33vd/VBg=";
+      })
+      # Remove invalid method overload which confuses the QML engine
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/5679a6141c76ae7d64c3acc8a87b1adb048289e0.patch";
+        hash = "sha256-z8f8kLhC9CqBOfGPL8W9KJq7MwALAAicXfRkHiQEVJ4=";
+      })
+      # Specify enum flag type properly in unit test
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/a43cc24e57db8d3c3939fa540d67da3294dcfc5c.patch";
+        hash = "sha256-SsYkxX6prxi8VRZr4az+wqawcRN8tR3UuIFswJL+3T4=";
+      })
+      # Update qHash methods to return size_t instead of uint
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/9c698155d82fc2b68a87c59d0443c33f9085b117.patch";
+        hash = "sha256-rb8D8taaglhQikYSAPrtLvazgIw8Nga/a9+J21k8gIo=";
+      })
+      # Mark virtual methods with override keyword
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/f34cf2ff2b0f428d5b8a70763b29088075ebbd1c.patch";
+        hash = "sha256-tNPOEVpx1eqHx5T23ueW32KxMQ/SB+TBCJ4PZ6SA3LI=";
+      })
+      # Fix calendardemo example
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/a66590d473753bc49105d3132fb9e4150c92a14a.patch";
+        hash = "sha256-RPRtGQ24NQYewnv6+IqYITpwD/XxuK68a1iKgFmKm3c=";
+      })
+      # Make the tests pass on big endian systems
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/7802f038ed1391078e27fa3f37d785a69314537b.patch";
+        hash = "sha256-hogUXyPXjGE0q53PWOjiQbQ2YzOsvrJ7mo9djGIbjVQ=";
+      })
+      # Fix some deprecated QChar constructor issues in unit tests
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/114615812dcf9398c957b0833e860befe15f840f.patch";
+        hash = "sha256-yZ1qs8y5DSq8FDXRPyuSPRIzjEUTWAhpVide/b+xaLQ=";
+      })
+      # Accessors should be const
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/a2bf7cdf05c264b5dd2560f799760b5508f154e4.patch";
+        hash = "sha256-+YfPrKyOKnPkqFokwW/aDsEivg4TzdJwQpDdAtM+rQE=";
+      })
+      # Enforce detail access constraints in contact operations by default
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/8765a35233aa21a932ee92bbbb92a5f8edd4dc68.patch";
+        hash = "sha256-vp/enerVecEXz4zyxQ66DG+fVVWxI4bYnLj92qaaqNk=";
+      })
+      # Fixes broken file generation, which breaks reverse dependencies that try to find one of its modules
+      (fetchpatch {
+        url = "https://github.com/qt/qtpim/commit/4b2bdce30bd0629c9dc0567af6eeaa1d038f3152.patch";
+        hash = "sha256-2dXhkZyxPvY2KQq2veerAlpXkpU5/FeArWRlm1aOcEY=";
+      })
+
+      ## Patches that haven't been upstreamed
+
+      # Fix tst_QContactManager::compareVariant_data test
+      (fetchpatch {
+        url = "https://salsa.debian.org/qt-kde-team/qt/qtpim/-/raw/360682f88457b5ae7c92f32f574e51ccc5edbea0/debian/patches/1001_fix-qtdatetime-null-comparison.patch";
+        hash = "sha256-k/rO9QjwSlRChwFTZLkxDjZWqFkua4FNbaNf1bJKLxc=";
+      })
+      # Avoid crash while parsing vCards from different threads
+      (fetchpatch {
+        url = "https://salsa.debian.org/qt-kde-team/qt/qtpim/-/raw/360682f88457b5ae7c92f32f574e51ccc5edbea0/debian/patches/1002_Avoid-crash-while-parsing-vcards-from-different-threads.patch";
+        hash = "sha256-zhayAoWgcmKosEGVBy2k6a2e6BxyVwfGX18tBbzqEk8=";
+      })
+      # Adapt to JSON parser behavior change in Qt 5.15
+      (fetchpatch {
+        url = "https://salsa.debian.org/qt-kde-team/qt/qtpim/-/raw/360682f88457b5ae7c92f32f574e51ccc5edbea0/debian/patches/1003_adapt_to_json_parser_change.patch";
+        hash = "sha256-qAIa48hmDd8vMH/ywqW+22vISKai76XnjgFuB+tQbIU=";
+      })
+      # Fix version being 0.0.0
+      (fetchpatch {
+        url = "https://salsa.debian.org/qt-kde-team/qt/qtpim/-/raw/360682f88457b5ae7c92f32f574e51ccc5edbea0/debian/patches/2000_revert_module_version.patch";
+        hash = "sha256-6wg/eVu9J83yvIO428U1FX3otz58tAy6pCvp7fqOBKU=";
+      })
+    ];
     qtscript = [ ./qtscript.patch ];
     qtserialport = [ ./qtserialport.patch ];
     qtsystems = [
@@ -167,6 +259,7 @@ let
         inherit gstreamer gst-plugins-base;
       };
       qtnetworkauth = callPackage ../modules/qtnetworkauth.nix {};
+      qtpim = callPackage ../modules/qtpim.nix {};
       qtpositioning = callPackage ../modules/qtpositioning.nix {};
       qtquick1 = null;
       qtquickcontrols = callPackage ../modules/qtquickcontrols.nix {};
diff --git a/pkgs/development/libraries/qt-5/5.15/srcs.nix b/pkgs/development/libraries/qt-5/5.15/srcs.nix
index 8d910428feb..d47f9705d21 100644
--- a/pkgs/development/libraries/qt-5/5.15/srcs.nix
+++ b/pkgs/development/libraries/qt-5/5.15/srcs.nix
@@ -22,6 +22,18 @@ let
 in
 lib.mapAttrs mk (lib.importJSON ./srcs-generated.json)
 // {
+  # qtpim has no official releases
+  qtpim = {
+    version = "unstable-2020-11-02";
+    src = fetchFromGitHub {
+      owner = "qt";
+      repo = "qtpim";
+      # Last commit before Qt5 support was broken
+      rev = "f9a8f0fc914c040d48bbd0ef52d7a68eea175a98";
+      hash = "sha256-/1g+vvHjuRLB1vsm41MrHbBZ+88Udca0iEcbz0Q1BNQ=";
+    };
+  };
+
   # Has no kde/5.15 branch
   qtpositioning = rec {
     version = "5.15.2";
diff --git a/pkgs/development/libraries/qt-5/modules/qtpim.nix b/pkgs/development/libraries/qt-5/modules/qtpim.nix
new file mode 100644
index 00000000000..702655c6e7f
--- /dev/null
+++ b/pkgs/development/libraries/qt-5/modules/qtpim.nix
@@ -0,0 +1,27 @@
+{ qtModule
+, lib
+, qtbase
+, qtdeclarative
+}:
+
+qtModule {
+  pname = "qtpim";
+
+  outputs = [
+    "out"
+    "dev"
+  ];
+
+  qtInputs = [
+    qtbase
+    qtdeclarative
+  ];
+
+  qmakeFlags = [
+    "CONFIG+=git_build"
+  ];
+
+  meta = {
+    maintainers = with lib.maintainers; [ OPNA2608 ];
+  };
+}