diff --git a/native/doscalls-lx.h b/native/doscalls-lx.h
index 201ac56..13934ad 100644
--- a/native/doscalls-lx.h
+++ b/native/doscalls-lx.h
@@ -133,6 +133,12 @@ static APIRET16 bridge16to32_Dos16FindNext(uint8 *args) {
     return Dos16FindNext(hDir, pfindbuf, cbfindbuf, pcFilenames);
 }
 
+static APIRET16 bridge16to32_Dos16MkDir(uint8 *args) {
+    LX_NATIVE_MODULE_16BIT_BRIDGE_PTRARG(PEAOP2, peaop2);
+    LX_NATIVE_MODULE_16BIT_BRIDGE_PTRARG(PSZ, pszDirName);
+    return Dos16MkDir(pszDirName, peaop2);
+}
+
 static APIRET16 bridge16to32_Dos16Open(uint8 *args) {
     LX_NATIVE_MODULE_16BIT_BRIDGE_PTRARG(PEAOP2, peaop2);
     LX_NATIVE_MODULE_16BIT_BRIDGE_ARG(USHORT, fsOpenMode);
@@ -259,6 +265,12 @@ static APIRET16 bridge16to32_Dos16ExecPgm(uint8 *args) {
     return Dos16ExecPgm(pObjname, cbObjname, execFlag, pArg, pEnv, pRes, pName);
 }
 
+static APIRET16 bridge16to32_Dos16MkDir2(uint8 *args) {
+    LX_NATIVE_MODULE_16BIT_BRIDGE_PTRARG(PEAOP2, peaop2);
+    LX_NATIVE_MODULE_16BIT_BRIDGE_PTRARG(PSZ, pszDirName);
+    return Dos16MkDir2(pszDirName, peaop2);
+}
+
 LX_NATIVE_MODULE_16BIT_SUPPORT()
     LX_NATIVE_MODULE_16BIT_API(Dos16CWait)
     LX_NATIVE_MODULE_16BIT_API(Dos16Exit)
@@ -279,6 +291,7 @@ LX_NATIVE_MODULE_16BIT_SUPPORT()
     LX_NATIVE_MODULE_16BIT_API(Dos16FindClose)
     LX_NATIVE_MODULE_16BIT_API(Dos16FindFirst)
     LX_NATIVE_MODULE_16BIT_API(Dos16FindNext)
+    LX_NATIVE_MODULE_16BIT_API(Dos16MkDir)
     LX_NATIVE_MODULE_16BIT_API(Dos16Open)
     LX_NATIVE_MODULE_16BIT_API(Dos16QCurDir)
     LX_NATIVE_MODULE_16BIT_API(Dos16QCurDisk)
@@ -297,6 +310,7 @@ LX_NATIVE_MODULE_16BIT_SUPPORT()
     LX_NATIVE_MODULE_16BIT_API(DosSemWait)
     LX_NATIVE_MODULE_16BIT_API(DosSemSet)
     LX_NATIVE_MODULE_16BIT_API(Dos16ExecPgm)
+    LX_NATIVE_MODULE_16BIT_API(Dos16MkDir2)
 LX_NATIVE_MODULE_16BIT_SUPPORT_END()
 
 LX_NATIVE_MODULE_DEINIT({
@@ -324,6 +338,7 @@ static int init16_doscalls(void) {
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16FindClose, 2)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16FindFirst, 24)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16FindNext, 12)
+        LX_NATIVE_INIT_16BIT_BRIDGE(Dos16MkDir, 8)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16Open, 26)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16QCurDir, 10)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16QCurDisk, 8)
@@ -342,6 +357,7 @@ static int init16_doscalls(void) {
         LX_NATIVE_INIT_16BIT_BRIDGE(DosSemWait, 8)
         LX_NATIVE_INIT_16BIT_BRIDGE(DosSemSet, 4)
         LX_NATIVE_INIT_16BIT_BRIDGE(Dos16ExecPgm, 24)
+        LX_NATIVE_INIT_16BIT_BRIDGE(Dos16MkDir2, 8)
     LX_NATIVE_MODULE_INIT_16BIT_SUPPORT_END()
     return 1;
 }
@@ -366,6 +382,7 @@ LX_NATIVE_MODULE_INIT({ if (!init16_doscalls()) return 0; })
     LX_NATIVE_EXPORT16(Dos16FindClose, 63),
     LX_NATIVE_EXPORT16(Dos16FindFirst, 64),
     LX_NATIVE_EXPORT16(Dos16FindNext, 65),
+    LX_NATIVE_EXPORT16(Dos16MkDir, 66),
     LX_NATIVE_EXPORT16(Dos16Open, 70),
     LX_NATIVE_EXPORT16(Dos16QCurDir, 71),
     LX_NATIVE_EXPORT16(Dos16QCurDisk, 72),
@@ -384,6 +401,7 @@ LX_NATIVE_MODULE_INIT({ if (!init16_doscalls()) return 0; })
     LX_NATIVE_EXPORT16(DosSemWait, 142),
     LX_NATIVE_EXPORT16(DosSemSet, 143),
     LX_NATIVE_EXPORT16(Dos16ExecPgm, 144),
+    LX_NATIVE_EXPORT16(Dos16MkDir2, 185),
     LX_NATIVE_EXPORT(DosSetMaxFH, 209),
     LX_NATIVE_EXPORT(DosSetPathInfo, 219),
     LX_NATIVE_EXPORT(DosQueryPathInfo, 223),
@@ -402,6 +420,7 @@ LX_NATIVE_MODULE_INIT({ if (!init16_doscalls()) return 0; })
     LX_NATIVE_EXPORT(DosFindClose, 263),
     LX_NATIVE_EXPORT(DosFindFirst, 264),
     LX_NATIVE_EXPORT(DosFindNext, 265),
+    LX_NATIVE_EXPORT(DosCreateDir, 270),
     LX_NATIVE_EXPORT(DosSetFileSize, 272),
     LX_NATIVE_EXPORT(DosOpen, 273),
     LX_NATIVE_EXPORT(DosQueryCurrentDir, 274),
diff --git a/native/doscalls.c b/native/doscalls.c
index 4115b6f..a109124 100644
--- a/native/doscalls.c
+++ b/native/doscalls.c
@@ -2947,6 +2947,47 @@ APIRET DosSetCurrentDir(PSZ pszName)
 } // DosSetCurrentDir
 
 
+static APIRET DosCreateDir_implementation(PSZ pszDirName, PEAOP2 peaop2)
+{
+    if (peaop2 != NULL) {
+        FIXME("EAs not yet implemented");
+        return ERROR_EA_LIST_INCONSISTENT;
+    }
+
+    uint32 err = 0;
+    char *path = makeUnixPath(pszDirName, &err);
+    if (!path) return (APIRET) err;
+
+    const int rc = mkdir(path, 0755);
+    free(path);
+    if (rc == -1) {
+        switch (errno) {
+            case EACCES: return ERROR_ACCESS_DENIED;
+            case EBUSY: return ERROR_ACCESS_DENIED;
+            case EISDIR: return ERROR_ACCESS_DENIED;
+            case ENAMETOOLONG: return ERROR_FILENAME_EXCED_RANGE;
+            case ENOENT: return ERROR_FILE_NOT_FOUND;  // !!! FIXME: could be PATH_NOT_FOUND too, depending on circumstances.
+            case ENOTDIR: return ERROR_PATH_NOT_FOUND;
+            case EPERM: return ERROR_ACCESS_DENIED;
+            case EROFS: return ERROR_ACCESS_DENIED;
+            case ETXTBSY: return ERROR_ACCESS_DENIED;
+            default: return ERROR_INVALID_PARAMETER;  // !!! FIXME: debug logging about missin errno case.
+        }
+        __builtin_unreachable();
+    }
+
+    return NO_ERROR;
+} // DosCreateDir_implementation
+
+
+APIRET DosCreateDir(PSZ pszDirName, PEAOP2 peaop2)
+{
+    TRACE_NATIVE("DosCreateDir('%s', %p)", pszDirName, peaop2);
+    return DosCreateDir_implementation(pszDirName, peaop2);
+} // DosCreateDir
+
+
+
 #if !LX_LEGACY
 ULONG DosSelToFlat(VOID) { return 0; }
 #else
@@ -3620,6 +3661,19 @@ APIRET16 Dos16Beep(USHORT freq, USHORT duration)
 } // Dos16Beep
 
 
+APIRET16 Dos16MkDir(PSZ pszDirName, PEAOP2 peaop2)
+{
+    TRACE_NATIVE("Dos16MkDir('%s', %p)", pszDirName, peaop2);
+    return DosCreateDir_implementation(pszDirName, peaop2);
+}
+
+APIRET16 Dos16MkDir2(PSZ pszDirName, PEAOP2 peaop2)  // !!! FIXME: check this.
+{
+    TRACE_NATIVE("Dos16MkDir('%s', %p)", pszDirName, peaop2);
+    return DosCreateDir_implementation(pszDirName, peaop2);
+}
+
+
 LX_NATIVE_CONSTRUCTOR(doscalls)
 {
     GLoaderState.dosExit = DosExit;
diff --git a/native/doscalls.h b/native/doscalls.h
index 730a8d8..583c643 100644
--- a/native/doscalls.h
+++ b/native/doscalls.h
@@ -545,6 +545,8 @@ OS2EXPORT APIRET16 OS2API16 Dos16ExecPgm(PCHAR pObjname, SHORT cbObjname, USHORT
 OS2EXPORT APIRET16 OS2API16 Dos16CWait(USHORT action, USHORT option, PRESULTCODES16 pres, PUSHORT ppid, USHORT pid) OS2APIINFO(2);
 OS2EXPORT APIRET16 OS2API16 Dos16ChgFilePtr(USHORT handle, LONG distance, USHORT whence, PULONG newoffset) OS2APIINFO(58);
 OS2EXPORT APIRET16 OS2API16 Dos16Beep(USHORT freq, USHORT dur) OS2APIINFO(50);
+OS2EXPORT APIRET16 OS2API16 Dos16MkDir(PSZ pszDirName, PEAOP2 peaop2) OS2APIINFO(66);   // !!! FIXME: check this one
+OS2EXPORT APIRET16 OS2API16 Dos16MkDir2(PSZ pszDirName, PEAOP2 peaop2) OS2APIINFO(185);  // !!! FIXME: check this one
 
 // !!! FIXME: these should probably get sorted alphabetically and/or grouped
 // !!! FIXME:  into areas of functionality, but for now, I'm just listing them
@@ -621,6 +623,7 @@ OS2EXPORT APIRET OS2API DosQueryFSAttach(PSZ pszDeviceName, ULONG ulOrdinal, ULO
 OS2EXPORT APIRET OS2API DosSetFileSize(HFILE hFile, ULONG cbSize) OS2APIINFO(272);
 OS2EXPORT APIRET OS2API DosSetCurrentDir(PSZ pszName) OS2APIINFO(255);
 OS2EXPORT APIRET OS2API DosBeep(ULONG freq, ULONG dur) OS2APIINFO(286);
+OS2EXPORT APIRET OS2API DosCreateDir(PSZ pszDirName, PEAOP2 peaop2) OS2APIINFO(270);
 
 #ifdef __cplusplus
 }