diff --git a/src/accelerator_cuda.h b/src/accelerator_cuda.h
deleted file mode 100644
index be81718280..0000000000
--- a/src/accelerator_cuda.h
+++ /dev/null
@@ -1,88 +0,0 @@
-/* -*- c++ -*- ----------------------------------------------------------
-   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
-   http://lammps.sandia.gov, Sandia National Laboratories
-   Steve Plimpton, sjplimp@sandia.gov
-
-   Copyright (2003) Sandia Corporation.  Under the terms of Contract
-   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
-   certain rights in this software.  This software is distributed under
-   the GNU General Public License.
-
-   See the README file in the top-level LAMMPS directory.
-------------------------------------------------------------------------- */
-
-#ifndef LMP_ACCELERATOR_CUDA_H
-#define LMP_ACCELERATOR_CUDA_H
-
-// true interface to USER-CUDA
-// used when USER-CUDA is installed
-
-#ifdef LMP_USER_CUDA
-
-#include "user_cuda.h"
-#include "comm_cuda.h"
-#include "domain_cuda.h"
-#include "neighbor_cuda.h"
-#include "modify_cuda.h"
-#include "verlet_cuda.h"
-
-#else
-
-// dummy interface to USER-CUDA
-// needed for compiling when USER-CUDA is not installed
-
-#include "comm_brick.h"
-#include "domain.h"
-#include "neighbor.h"
-#include "modify.h"
-#include "verlet.h"
-
-namespace LAMMPS_NS {
-
-class Cuda {
- public:
-  int cuda_exists;
-  int oncpu;
-
-  Cuda(class LAMMPS *) {cuda_exists = 0;}
-  ~Cuda() {}
-  void accelerator(int, char **) {}
-  void evsetup_eatom_vatom(int, int) {}
-  void downloadAll() {}
-  void uploadAll() {}
-};
-
-class CommCuda : public CommBrick {
- public:
- CommCuda(class LAMMPS *lmp) : CommBrick(lmp) {}
-  ~CommCuda() {}
-};
-
-class DomainCuda : public Domain {
- public:
- DomainCuda(class LAMMPS *lmp) : Domain(lmp) {}
-  ~DomainCuda() {}
-};
-
-class NeighborCuda : public Neighbor {
- public:
- NeighborCuda(class LAMMPS *lmp) : Neighbor(lmp) {}
-  ~NeighborCuda() {}
-};
-
-class ModifyCuda : public Modify {
- public:
- ModifyCuda(class LAMMPS *lmp) : Modify(lmp) {}
-  ~ModifyCuda() {}
-};
-
-class VerletCuda : public Verlet {
- public:
- VerletCuda(class LAMMPS *lmp, int narg, char **arg) : Verlet(lmp,narg,arg) {}
-  ~VerletCuda() {}
-};
-
-}
-
-#endif
-#endif
diff --git a/src/lammps.cpp b/src/lammps.cpp
index 56829e1246..af9950073f 100644
--- a/src/lammps.cpp
+++ b/src/lammps.cpp
@@ -42,7 +42,6 @@
 #include "group.h"
 #include "output.h"
 #include "citeme.h"
-#include "accelerator_cuda.h"
 #include "accelerator_kokkos.h"
 #include "accelerator_omp.h"
 #include "accelerator_intel.h"
@@ -80,7 +79,6 @@ LAMMPS::LAMMPS(int narg, char **arg, MPI_Comm communicator)
   int logflag = 0;
   int partscreenflag = 0;
   int partlogflag = 0;
-  int cudaflag = 0;
   int kokkosflag = 0;
   int restartflag = 0;
   int restartremapflag = 0;
@@ -153,14 +151,6 @@ LAMMPS::LAMMPS(int narg, char **arg, MPI_Comm communicator)
        error->universe_all(FLERR,"Invalid command-line argument");
       partlogflag = iarg + 1;
       iarg += 2;
-    } else if (strcmp(arg[iarg],"-cuda") == 0 ||
-               strcmp(arg[iarg],"-c") == 0) {
-      if (iarg+2 > narg)
-        error->universe_all(FLERR,"Invalid command-line argument");
-      if (strcmp(arg[iarg+1],"on") == 0) cudaflag = 1;
-      else if (strcmp(arg[iarg+1],"off") == 0) cudaflag = 0;
-      else error->universe_all(FLERR,"Invalid command-line argument");
-      iarg += 2;
     } else if (strcmp(arg[iarg],"-kokkos") == 0 ||
                strcmp(arg[iarg],"-k") == 0) {
       if (iarg+2 > narg)
@@ -470,25 +460,6 @@ LAMMPS::LAMMPS(int narg, char **arg, MPI_Comm communicator)
     error->all(FLERR,"Small to big integers are not sized correctly");
 #endif
 
-  // error check on accelerator packages
-
-  if (cudaflag == 1 && kokkosflag == 1)
-    error->all(FLERR,"Cannot use -cuda on and -kokkos on together");
-
-  // create Cuda class if USER-CUDA installed, unless explicitly switched off
-  // instantiation creates dummy Cuda class if USER-CUDA is not installed
-
-  cuda = NULL;
-  if (cudaflag == 1) {
-    cuda = new Cuda(this);
-    if (!cuda->cuda_exists)
-      error->all(FLERR,"Cannot use -cuda on without USER-CUDA installed");
-  }
-
-  int me;
-  MPI_Comm_rank(world,&me);
-  if (cuda && me == 0) error->message(FLERR,"USER-CUDA mode is enabled");
-
   // create Kokkos class if KOKKOS installed, unless explicitly switched off
   // instantiation creates dummy Kokkos class if KOKKOS is not installed
   // add args between kkfirst and kklast to Kokkos instantiation