diff --git a/src/d_main.cpp b/src/d_main.cpp
index 08ff77a5d..aa758cde3 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -567,6 +567,23 @@ CVAR (Flag, sv_alwaysspawnmulti,	dmflags2, DF2_ALWAYS_SPAWN_MULTI);
 CVAR (Flag, sv_novertspread,		dmflags2, DF2_NOVERTSPREAD);
 CVAR (Flag, sv_noextraammo,			dmflags2, DF2_NO_EXTRA_AMMO);
 
+//==========================================================================
+//
+// CVAR dmflags3
+//
+//==========================================================================
+
+CUSTOM_CVAR(Int, dmflags3, 0, CVAR_SERVERINFO | CVAR_NOINITCALL)
+{
+	if ((self & DF3_NO_PLAYER_CLIP) && (!multiplayer || deathmatch))
+	{
+		self = self & ~DF3_NO_PLAYER_CLIP;
+		Printf("No player clipping is only available in coop\n");
+	}
+}
+
+CVAR(Flag, sv_noplayerclip, dmflags3, DF3_NO_PLAYER_CLIP);
+
 //==========================================================================
 //
 // CVAR compatflags
diff --git a/src/doomdef.h b/src/doomdef.h
index 6982fed06..641e4597a 100644
--- a/src/doomdef.h
+++ b/src/doomdef.h
@@ -176,6 +176,12 @@ enum : unsigned
 	DF2_NO_EXTRA_AMMO		= 1u << 31,	// Don't add extra ammo when picking up weapons (like in original Doom)
 };
 
+// [Nash] dmflags3 in 2023 let's gooooo
+enum : unsigned
+{
+	DF3_NO_PLAYER_CLIP		= 1 << 0,	// Players can walk through and shoot through each other
+};
+
 // [RH] Compatibility flags.
 enum : unsigned int
 {
diff --git a/src/doomstat.h b/src/doomstat.h
index c95d0cdca..cc991a4fe 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -233,6 +233,7 @@ EXTERN_CVAR (Int, infighting)
 
 EXTERN_CVAR (Int, dmflags);
 EXTERN_CVAR (Int, dmflags2);	// [BC]
+EXTERN_CVAR (Int, dmflags3);	// [Nash]
 
 EXTERN_CVAR (Int, compatflags);
 EXTERN_CVAR (Int, compatflags2);
diff --git a/src/playsim/p_map.cpp b/src/playsim/p_map.cpp
index a9852bd6b..81f78eeb5 100644
--- a/src/playsim/p_map.cpp
+++ b/src/playsim/p_map.cpp
@@ -492,6 +492,9 @@ bool	P_TeleportMove(AActor* thing, const DVector3 &pos, bool telefrag, bool modi
 		if (tmf.thing->flags6 & MF6_THRUSPECIES && tmf.thing->GetSpecies() == th->GetSpecies())
 			continue;
 
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (tmf.thing->player && th->player))
+			continue;
+
 		// [RH] Z-Check
 		// But not if not MF2_PASSMOBJ or MF3_DONTOVERLAP are set!
 		// Otherwise those things would get stuck inside each other.
@@ -1371,6 +1374,9 @@ bool PIT_CheckThing(FMultiBlockThingsIterator &it, FMultiBlockThingsIterator::Ch
 	if ((tm.thing->flags6 & MF6_THRUSPECIES) && (tm.thing->GetSpecies() == thing->GetSpecies()))
 		return true;
 
+	if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (thing->player && tm.thing->player))
+		return true;
+
 	tm.thing->BlockingMobj = thing;
 	topz = thing->Top();
 
@@ -1552,6 +1558,9 @@ bool PIT_CheckThing(FMultiBlockThingsIterator &it, FMultiBlockThingsIterator::Ch
 			&& (tm.thing->target->GetSpecies() == thing->GetSpecies()))
 			return true;
 
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (tm.thing->target->player && thing->player))
+			return true;
+
 		// Check for rippers passing through corpses
 		if ((thing->flags & MF_CORPSE) && (tm.thing->flags2 & MF2_RIP) && !(thing->flags & MF_SHOOTABLE))
 		{
@@ -2063,6 +2072,10 @@ int P_TestMobjZ(AActor *actor, bool quick, AActor **pOnmobj)
 		{
 			continue;
 		}
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (thing->player && actor->player))
+		{
+			continue;
+		}
 		if (!(thing->flags & MF_SOLID))
 		{ // Can't hit thing
 			continue;
@@ -4456,12 +4469,14 @@ static ETraceStatus CheckForActor(FTraceResults &res, void *userdata)
 	// 3. MTHRUSPECIES on puff and the shooter has same species as the hit actor
 	// 4. THRUSPECIES on puff and the puff has same species as the hit actor
 	// 5. THRUGHOST on puff and the GHOST flag on the hit actor
+	// 6. Skip through players in coop if sv_noplayerclip is enabled
 
 	if ((data->ThruActors) || 
 		(!(data->Spectral) && res.Actor->flags4 & MF4_SPECTRAL) ||
 		(data->MThruSpecies && res.Actor->GetSpecies() == data->Caller->GetSpecies()) ||
 		(data->ThruSpecies && res.Actor->GetSpecies() == data->PuffSpecies) ||
-		(data->hitGhosts && res.Actor->flags3 & MF3_GHOST))
+		(data->hitGhosts && res.Actor->flags3 & MF3_GHOST) ||
+		((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (res.Actor->player && data->Caller->player)))
 	{
 		return TRACE_Skip;
 	}
@@ -5195,12 +5210,14 @@ static ETraceStatus ProcessRailHit(FTraceResults &res, void *userdata)
 	// 2. MTHRUSPECIES on puff and the shooter has same species as the hit actor
 	// 3. THRUSPECIES on puff and the puff has same species as the hit actor
 	// 4. THRUGHOST on puff and the GHOST flag on the hit actor
+	// 5. Skip through players in coop if sv_noplayerclip is enabled
 
 	if ((data->ThruActors) ||
 		(data->UseThruBits && (data->ThruBits & res.Actor->ThruBits)) ||
 		(data->MThruSpecies && res.Actor->GetSpecies() == data->Caller->GetSpecies()) ||
 		(data->ThruSpecies && res.Actor->GetSpecies() == data->PuffSpecies) ||
-		(data->ThruGhosts && res.Actor->flags3 & MF3_GHOST))
+		(data->ThruGhosts && res.Actor->flags3 & MF3_GHOST) ||
+		((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (res.Actor->player && data->Caller->player)))
 	{
 		return TRACE_Skip;
 	}
@@ -6014,6 +6031,9 @@ int P_RadiusAttack(AActor *bombspot, AActor *bombsource, int bombdamage, int bom
 		if (thing->flags3 & MF3_NORADIUSDMG && !(bombspot->flags4 & MF4_FORCERADIUSDMG))
 			continue;
 
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (thing->player && bombsource->player))
+			continue;
+
 		if (!(flags & RADF_HURTSOURCE) && (thing == bombsource || thing == bombspot))
 		{ // don't damage the source of the explosion
 			continue;
@@ -6427,6 +6447,9 @@ int P_PushUp(AActor *thing, FChangePosition *cpos)
 		if (!P_CanCollideWith(thing, intersect))
 			continue;
 
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (thing->player && intersect->player))
+			continue;
+
 		if (!(intersect->flags2 & MF2_PASSMOBJ) ||
 			(!(intersect->flags3 & MF3_ISMONSTER) && intersect->Mass > mymass) ||
 			(intersect->flags4 & MF4_ACTLIKEBRIDGE)
@@ -6491,6 +6514,9 @@ int P_PushDown(AActor *thing, FChangePosition *cpos)
 		if (!P_CanCollideWith(thing, intersect))
 			continue;
 
+		if ((multiplayer && !deathmatch) && (dmflags3 & DF3_NO_PLAYER_CLIP) && (thing->player && intersect->player))
+			continue;
+
 		if (!(intersect->flags2 & MF2_PASSMOBJ) ||
 			(!(intersect->flags3 & MF3_ISMONSTER) && intersect->Mass > mymass) ||
 			(intersect->flags4 & MF4_ACTLIKEBRIDGE)
diff --git a/wadsrc/static/menudef.txt b/wadsrc/static/menudef.txt
index b05ee889b..6f3560fb6 100644
--- a/wadsrc/static/menudef.txt
+++ b/wadsrc/static/menudef.txt
@@ -1702,6 +1702,7 @@ OptionMenu CoopOptions protected
 	Option "$GMPLYMNU_KEEPAMMO",				"sv_cooploseammo", "NoYes"
 	Option "$GMPLYMNU_LOSEHALFAMMO",			"sv_coophalveammo", "YesNo"
 	Option "$GMPLYMNU_SPAWNWHEREDIED",			"sv_samespawnspot", "YesNo"
+	Option "$GMPLYMNU_NOPLAYERCLIP",			"sv_noplayerclip", "YesNo"
 	Class "GameplayMenu"
 }
 
diff --git a/wadsrc/static/zscript/actors/doom/weaponbfg.zs b/wadsrc/static/zscript/actors/doom/weaponbfg.zs
index 583688f8d..8e436ed46 100644
--- a/wadsrc/static/zscript/actors/doom/weaponbfg.zs
+++ b/wadsrc/static/zscript/actors/doom/weaponbfg.zs
@@ -230,7 +230,8 @@ extend class Actor
 				if (spray != null)
 				{
 					if ((spray.bMThruSpecies && target.GetSpecies() == t.linetarget.GetSpecies()) || 
-						(!(flags & BFGF_HURTSOURCE) && target == t.linetarget)) // [XA] Don't hit oneself unless we say so.
+						(!(flags & BFGF_HURTSOURCE) && target == t.linetarget) || // [XA] Don't hit oneself unless we say so.
+						(multiplayer && !deathmatch) && sv_noplayerclip && (target.player && t.linetarget.player))
 					{
 						spray.Destroy(); // [MC] Remove it because technically, the spray isn't trying to "hit" them.
 						continue;
diff --git a/wadsrc/static/zscript/ui/menu/doommenus.zs b/wadsrc/static/zscript/ui/menu/doommenus.zs
index 969437a8b..9affca2bc 100644
--- a/wadsrc/static/zscript/ui/menu/doommenus.zs
+++ b/wadsrc/static/zscript/ui/menu/doommenus.zs
@@ -4,7 +4,7 @@ class GameplayMenu : OptionMenu
 	{
 		Super.Drawer();
 
-		String s = String.Format("dmflags = %d   dmflags2 = %d", dmflags, dmflags2);
+		String s = String.Format("dmflags = %d  dmflags2 = %d  dmflags3 = %d", dmflags, dmflags2, dmflags3);
 		screen.DrawText (OptionFont(), OptionMenuSettings.mFontColorValue,
 			(screen.GetWidth() - OptionWidth (s) * CleanXfac_1) / 2, 35 * CleanXfac_1, s,
 			DTA_CleanNoMove_1, true);