diff --git a/Configuration/Eras/python/Modifier_run3_nanoAOD_pre142X_cff.py b/Configuration/Eras/python/Modifier_run3_nanoAOD_pre142X_cff.py
new file mode 100644
index 0000000000000..624adda8348aa
--- /dev/null
+++ b/Configuration/Eras/python/Modifier_run3_nanoAOD_pre142X_cff.py
@@ -0,0 +1,3 @@
+import FWCore.ParameterSet.Config as cms
+
+run3_nanoAOD_pre142X = cms.Modifier()
diff --git a/Configuration/PyReleaseValidation/python/relval_nano.py b/Configuration/PyReleaseValidation/python/relval_nano.py
index 2a263de0607a0..4254f63c4a57f 100644
--- a/Configuration/PyReleaseValidation/python/relval_nano.py
+++ b/Configuration/PyReleaseValidation/python/relval_nano.py
@@ -148,7 +148,7 @@ def subnext(self):
 steps['TTbarMINIAOD13.0'] = {'INPUT': InputInfo(
     location='STD', dataSet='/TTtoLNu2Q_TuneCP5_13p6TeV_powheg-pythia8/Run3Summer23MiniAODv4-130X_mcRun3_2023_realistic_v14-v2/MINIAODSIM')}
 
-steps['NANO_mc13.0'] = merge([{'--era': 'Run3', '--conditions': 'auto:phase1_2023_realistic'},
+steps['NANO_mc13.0'] = merge([{'--era': 'Run3,run3_nanoAOD_pre142X', '--conditions': 'auto:phase1_2023_realistic'},
                               _NANO_mc])
 
 
@@ -160,7 +160,7 @@ def subnext(self):
     dataSet='/ScoutingPFRun3/Run2022D-v1/RAW', label='2022D', events=100000, location='STD', ls=Run2022D)}
 
 
-steps['NANO_data13.0'] = merge([{'--era': 'Run3', '--conditions': 'auto:run3_data'},
+steps['NANO_data13.0'] = merge([{'--era': 'Run3,run3_nanoAOD_pre142X', '--conditions': 'auto:run3_data'},
                                 _NANO_data])
 
 steps['NANO_data13.0_prompt'] = merge([{'-s': 'NANO:@Prompt,DQM:@nanoAODDQM', '-n': '1000'},
@@ -176,7 +176,7 @@ def subnext(self):
 steps['TTbarMINIAOD14.0'] = {'INPUT': InputInfo(
     location='STD', dataSet='/RelValTTbar_14TeV/CMSSW_14_0_0-PU_140X_mcRun3_2024_realistic_v3_STD_2024_PU-v2/MINIAODSIM')}
 
-steps['NANO_mc14.0'] = merge([{'--era': 'Run3', '--conditions': 'auto:phase1_2024_realistic'},
+steps['NANO_mc14.0'] = merge([{'--era': 'Run3,run3_nanoAOD_pre142X', '--conditions': 'auto:phase1_2024_realistic'},
                               _NANO_mc])
 
 steps['muPOGNANO_mc14.0'] = merge([{'-s': 'NANO:@MUPOG,DQM:@nanoAODDQM', '-n': '1000'},
@@ -217,7 +217,7 @@ def subnext(self):
 steps['TestEnablesEcalHcal2024RAW14.0'] = {'INPUT': InputInfo(location='STD', ls={383173: [[151, 162]]},
                                                               dataSet='/TestEnablesEcalHcal/Run2024F-Express-v1/RAW')}
 
-steps['NANO_data14.0'] = merge([{'--era': 'Run3_2024', '--conditions': 'auto:run3_data_prompt'},
+steps['NANO_data14.0'] = merge([{'--era': 'Run3_2024,run3_nanoAOD_pre142X', '--conditions': 'auto:run3_data_prompt'},
                                 _NANO_data])
 
 steps['NANO_data14.0_prompt'] = merge([{'-s': 'NANO:@Prompt,DQM:@nanoAODDQM', '-n': '1000'},
diff --git a/Configuration/StandardSequences/python/Eras.py b/Configuration/StandardSequences/python/Eras.py
index 32d766e0ab9bc..b86d2867397ca 100644
--- a/Configuration/StandardSequences/python/Eras.py
+++ b/Configuration/StandardSequences/python/Eras.py
@@ -91,7 +91,7 @@ def __init__(self):
                            'trackingPhase2PU140','highBetaStar_2018',
                            'tracker_apv_vfp30_2016', 'pf_badHcalMitigationOff',
                            'run2_nanoAOD_106Xv2',
-                           'run3_nanoAOD_122', 'run3_nanoAOD_124',
+                           'run3_nanoAOD_122', 'run3_nanoAOD_124', 'run3_nanoAOD_pre142X',
                            'run3_ecal_devel',
                            'run3_upc',
                            'hcalHardcodeConditions', 'hcalSkipPacker',
diff --git a/PhysicsTools/NanoAOD/python/nano_eras_cff.py b/PhysicsTools/NanoAOD/python/nano_eras_cff.py
index 8f893205a7c41..cce9c50e42e35 100644
--- a/PhysicsTools/NanoAOD/python/nano_eras_cff.py
+++ b/PhysicsTools/NanoAOD/python/nano_eras_cff.py
@@ -19,6 +19,7 @@
 from Configuration.Eras.Modifier_run3_common_cff import run3_common
 from Configuration.Eras.Modifier_run3_nanoAOD_122_cff import run3_nanoAOD_122
 from Configuration.Eras.Modifier_run3_nanoAOD_124_cff import run3_nanoAOD_124
+from Configuration.Eras.Modifier_run3_nanoAOD_pre142X_cff import run3_nanoAOD_pre142X
 from Configuration.Eras.Modifier_run3_jme_Winter22runsBCDEprompt_cff import run3_jme_Winter22runsBCDEprompt
 
 run2_nanoAOD_ANY = (