diff --git a/Reconstruction/Jet/JetRec/CMakeLists.txt b/Reconstruction/Jet/JetRec/CMakeLists.txt
index 9ddd74e891a8006f5849c64f7633cfe2bb842e22..a9d0b6e43a32f2d16a695f2983aa33a9d53b71ec 100644
--- a/Reconstruction/Jet/JetRec/CMakeLists.txt
+++ b/Reconstruction/Jet/JetRec/CMakeLists.txt
@@ -17,6 +17,7 @@ atlas_depends_on_subdirs(
   PUBLIC
   Control/AthLinks
   Control/AthContainers
+  Control/AthenaMonitoringKernel
   Control/AthToolSupport/AsgTools
   Event/xAOD/xAODCaloEvent
   Event/xAOD/xAODJet
@@ -49,12 +50,12 @@ atlas_add_library( JetRecLib
   xAODCaloEvent xAODJet xAODMuon EventShapeInterface JetEDM
   JetInterface
   PRIVATE_LINK_LIBRARIES ${FASTJETCONTRIB_LIBRARIES} CxxUtils xAODBase xAODCore
-  xAODEventInfo xAODTracking )
+  xAODEventInfo xAODTracking AthenaMonitoringKernelLib)
 
 if( NOT XAOD_STANDALONE )
    atlas_add_component( JetRec
       src/*.h src/*.cxx src/components/*.cxx
-      LINK_LIBRARIES GaudiKernel AthenaBaseComps JetInterface JetRecLib )
+      LINK_LIBRARIES GaudiKernel AthenaBaseComps JetInterface JetRecLib AthenaMonitoringKernelLib )
 endif()
 
 atlas_add_dictionary( JetRecDict
diff --git a/Reconstruction/Jet/JetRec/JetRec/JetRecTool.h b/Reconstruction/Jet/JetRec/JetRec/JetRecTool.h
index dfa046763bc9954ea2d1a38e62b6930f7eb4268b..3f2928b9d12c20a80d60767a77cb17d4e9d5f8be 100644
--- a/Reconstruction/Jet/JetRec/JetRec/JetRecTool.h
+++ b/Reconstruction/Jet/JetRec/JetRec/JetRecTool.h
@@ -61,6 +61,7 @@
 #include "StoreGate/ReadHandleKeyArray.h"
 #include "JetEDM/PseudoJetVector.h"
 #include "JetRec/PseudoJetContainer.h"
+#include "AthenaMonitoringKernel/GenericMonitoringTool.h"
 
 class JetRecTool
 : public asg::AsgTool,
@@ -157,6 +158,10 @@ private:
   mutable std::vector<TStopwatch> m_modclocks;
   mutable std::vector<TStopwatch> m_conclocks;
 
+  ToolHandle<GenericMonitoringTool> m_monTool{this,"MonTool","","Monitoring tool"};
+
+  const double m_mevtogev = 0.001;
+
 };
 
 #endif
diff --git a/Reconstruction/Jet/JetRec/Root/JetRecTool.cxx b/Reconstruction/Jet/JetRec/Root/JetRecTool.cxx
index b7ebd872e4a478efc24a19ec1b4592b91d87aa55..38c961f07ddf872d35f405a9764bd36f00b052e2 100644
--- a/Reconstruction/Jet/JetRec/Root/JetRecTool.cxx
+++ b/Reconstruction/Jet/JetRec/Root/JetRecTool.cxx
@@ -22,6 +22,8 @@
 
 #include "StoreGate/ReadHandle.h"
 
+#include "AthenaMonitoringKernel/Monitored.h"
+
 typedef ToolHandleArray<IJetModifier> ModifierArray;
 typedef ToolHandleArray<IJetConsumer> ConsumerArray;
 
@@ -221,6 +223,8 @@ StatusCode JetRecTool::initialize() {
   m_conclock.Reset();
   m_nevt = 0;
 
+  if (!m_monTool.empty()) ATH_CHECK(m_monTool.retrieve());
+
   ATH_MSG_INFO("Timing detail: " << m_timer);
   return rstat;
 }
@@ -403,6 +407,15 @@ const JetContainer* JetRecTool::build() const {
     m_conclock.Stop();
   }
 
+  // monitor jet multiplicity and basic jet kinematics
+  auto njets = Monitored::Scalar<int>("nJets");
+  auto pt    = Monitored::Collection("pt",  *jetsHandle, [c=m_mevtogev]( const xAOD::Jet* jet ) { return jet->pt()*c; });
+  auto et    = Monitored::Collection("et",  *jetsHandle, [c=m_mevtogev]( const xAOD::Jet* jet ) { return jet->p4().Et()*c; });
+  auto eta   = Monitored::Collection("eta", *jetsHandle, []( const xAOD::Jet* jet ) { return jet->eta(); });
+  auto phi   = Monitored::Collection("phi", *jetsHandle, []( const xAOD::Jet* jet ) { return jet->phi(); });
+  auto mon   = Monitored::Group(m_monTool,njets,pt,et,eta,phi);
+  njets      = jetsHandle->size();
+
   m_totclock.Stop();
 
   return jetsHandle.isValid() ? &(*jetsHandle) : 0;
diff --git a/Reconstruction/Jet/JetRec/python/JetOnlineMon.py b/Reconstruction/Jet/JetRec/python/JetOnlineMon.py
new file mode 100644
index 0000000000000000000000000000000000000000..6c634f1cf5011260fa76acd35d44414c622eaa0d
--- /dev/null
+++ b/Reconstruction/Jet/JetRec/python/JetOnlineMon.py
@@ -0,0 +1,13 @@
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+
+# define histograms for monitoring of HLT jets
+def getMonTool_TrigJetAlgorithm(path):
+  from AthenaMonitoringKernel.GenericMonitoringTool import GenericMonitoringTool
+  monTool = GenericMonitoringTool('MonTool')
+  monTool.HistPath = path
+  monTool.defineHistogram( 'nJets', path='EXPERT', type='TH1F', title='Counts', xbins=100, xmin=0, xmax=100 )
+  monTool.defineHistogram( 'pt',    path='EXPERT', type='TH1F', title='Counts', xbins=100, xmin=0, xmax=500 )
+  monTool.defineHistogram( 'et',    path='EXPERT', type='TH1F', title='Counts', xbins=100, xmin=0, xmax=500 )
+  monTool.defineHistogram( 'eta',   path='EXPERT', type='TH1F', title='Counts', xbins=50, xmin=-5, xmax=5 )
+  monTool.defineHistogram( 'phi',   path='EXPERT', type='TH1F', title='Counts', xbins=50, xmin=-3, xmax=3 )
+  return monTool
diff --git a/Reconstruction/Jet/JetRecConfig/python/JetRecConfig.py b/Reconstruction/Jet/JetRecConfig/python/JetRecConfig.py
index 0c4d4ae3659c59f894e5c84d21e0dcf8d4fb8d0c..a660b656524281c606d7677be65f411c0159de9a 100644
--- a/Reconstruction/Jet/JetRecConfig/python/JetRecConfig.py
+++ b/Reconstruction/Jet/JetRecConfig/python/JetRecConfig.py
@@ -416,7 +416,7 @@ def getGhostPJGAlg(ghostdef):
 # Function for configuring the jet algorithm and builders, given the
 # set of dependencies
 #
-def getJetAlgorithm(jetname, jetdef, pjs, modlist):
+def getJetAlgorithm(jetname, jetdef, pjs, modlist, monTool = None):
     jetlog.debug("Configuring JetAlgorithm \"jetalg_{0}\"".format(jetname))
 
     builder = getJetBuilder()
@@ -431,6 +431,7 @@ def getJetAlgorithm(jetname, jetdef, pjs, modlist):
         mods.append(mod)
 
     rectool = getJetRecTool(jetname,finder,pjs,mods)
+    if monTool: rectool.MonTool = monTool
 
     jetalg = CompFactory.JetAlgorithm("jetalg_"+jetname)
     jetalg.Tools = [rectool]
diff --git a/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Jet/JetRecoSequences.py b/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Jet/JetRecoSequences.py
index 085a0dc22a553240b21dea255500d771a0fe94fa..bed06937ac70fdf526d51bf84f326da05947231d 100644
--- a/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Jet/JetRecoSequences.py
+++ b/Trigger/TriggerCommon/TriggerMenuMT/python/HLTMenuConfig/Jet/JetRecoSequences.py
@@ -181,9 +181,13 @@ def jetRecoSequence( dummyFlags, dataSource, RoIs = 'FSJETRoI', **jetRecoDict):
         calibMods = JetRecoConfiguration.defineCalibFilterMods(jetRecoDict,dataSource, rhoKey)
         jetModList += calibMods
 
+        # Get online monitoring tool
+        from JetRec import JetOnlineMon
+        monTool = JetOnlineMon.getMonTool_TrigJetAlgorithm("HLTJets/"+jetsFullName+"/")
+
         # Generate a JetAlgorithm to run the jet finding and modifiers
         # (via a JetRecTool instance).
-        jetRecAlg = JetRecConfig.getJetAlgorithm(jetsFullName, jetDef, pjs, jetModList)
+        jetRecAlg = JetRecConfig.getJetAlgorithm(jetsFullName, jetDef, pjs, jetModList, monTool)
         recoSeq += conf2toConfigurable( jetRecAlg )
         # End of basic jet reco
         pass