diff --git a/pkgs/development/libraries/physics/herwig/default.nix b/pkgs/development/libraries/physics/herwig/default.nix
new file mode 100644
index 000000000000..5edce48f3856
--- /dev/null
+++ b/pkgs/development/libraries/physics/herwig/default.nix
@@ -0,0 +1,44 @@
+{ stdenv, fetchpatch, fetchurl, boost, fastjet, gfortran, gsl, lhapdf, thepeg, zlib, autoconf, automake, libtool }:
+
+stdenv.mkDerivation rec {
+  name = "herwig-${version}";
+  version = "7.0.3";
+
+  src = fetchurl {
+    url = "http://www.hepforge.org/archive/herwig/Herwig-${version}.tar.bz2";
+    sha256 = "0v7b84n0v3dhjpx0vfk5p8g87kivgg9svfivnih1yrfm749269m2";
+  };
+
+  patches = [
+    # Otherwise it causes an error
+    # lib/Herwig/HwMatchboxScales.so: undefined symbol: _Z8renScaleSt6vectorIN6ThePEG14Lorentz5VectorIdEESaIS2_EES4_S4_
+    (fetchpatch {
+      url = "https://herwig.hepforge.org/hg/herwig/rev/fe543583fa02?style=raw";
+      sha256 = "1y6a9q93wicw3c73xni74w5k25vidgcr60ffi2b2ymhb390jas83";
+    })
+  ];
+
+  nativeBuildInputs = [ autoconf automake libtool ];
+
+  buildInputs = [ boost fastjet gfortran gsl thepeg zlib ]
+    # There is a bug that requires for MMHT PDF's to be presend during the build
+    ++ (with lhapdf.pdf_sets; [ MMHT2014lo68cl MMHT2014nlo68cl ]);
+
+  preConfigure = ''
+    # needed for the patch above
+    autoreconf -i
+  '';
+
+  configureFlags = [
+    "--with-thepeg=${thepeg}"
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "A multi-purpose particle physics event generator";
+    license     = stdenv.lib.licenses.gpl2;
+    homepage    = https://herwig.hepforge.org/;
+    platforms   = stdenv.lib.platforms.unix;
+  };
+}
diff --git a/pkgs/development/libraries/physics/thepeg/default.nix b/pkgs/development/libraries/physics/thepeg/default.nix
new file mode 100644
index 000000000000..5ea6daf8ed44
--- /dev/null
+++ b/pkgs/development/libraries/physics/thepeg/default.nix
@@ -0,0 +1,27 @@
+{ stdenv, fetchurl, boost, fastjet, gsl, hepmc, lhapdf, rivet, zlib }:
+
+stdenv.mkDerivation rec {
+  name = "thepeg-${version}";
+  version = "2.0.3";
+
+  src = fetchurl {
+    url = "http://www.hepforge.org/archive/thepeg/ThePEG-${version}.tar.bz2";
+    sha256 = "0d26linwv92iq23n4gx154jvyd0lz5vg41kf4nxa01nspy7scyy5";
+  };
+
+  buildInputs = [ boost fastjet gsl hepmc lhapdf rivet zlib ];
+
+  configureFlags = [
+    "--with-hepmc=${hepmc}"
+    "--without-javagui"
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "Toolkit for High Energy Physics Event Generation";
+    license     = stdenv.lib.licenses.gpl2;
+    homepage    = https://herwig.hepforge.org/;
+    platforms   = stdenv.lib.platforms.unix;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 410fb1d2276f..7276ea05dcf4 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16719,10 +16719,14 @@ in
 
   hepmc = callPackage ../development/libraries/physics/hepmc { };
 
+  herwig = callPackage ../development/libraries/physics/herwig { };
+
   lhapdf = callPackage ../development/libraries/physics/lhapdf { };
 
   rivet = callPackage ../development/libraries/physics/rivet { };
 
+  thepeg = callPackage ../development/libraries/physics/thepeg { };
+
   yoda = callPackage ../development/libraries/physics/yoda { };
 
   ### MISC