diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index c703897d98..33cccb64f4 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -832,123 +832,10 @@ pub fn getcwd(out_buffer: []u8) GetCwdError![]u8 {
     }
 }
 
-/// On Windows, `sub_dir_path` should be encoded as [WTF-8](https://wtf-8.codeberg.page/).
-/// On WASI, `sub_dir_path` should be encoded as valid UTF-8.
-/// On other platforms, `sub_dir_path` is an opaque sequence of bytes with no particular encoding.
-pub fn mkdirat(dir_fd: fd_t, sub_dir_path: []const u8, mode: mode_t) MakeDirError!void {
-    if (native_os == .windows) {
-        @compileError("use std.Io instead");
-    } else if (native_os == .wasi and !builtin.link_libc) {
-        @compileError("use std.Io instead");
-    } else {
-        const sub_dir_path_c = try toPosixPath(sub_dir_path);
-        return mkdiratZ(dir_fd, &sub_dir_path_c, mode);
-    }
-}
-
-/// Same as `mkdirat` except the parameters are null-terminated.
-pub fn mkdiratZ(dir_fd: fd_t, sub_dir_path: [*:0]const u8, mode: mode_t) MakeDirError!void {
-    if (native_os == .windows) {
-        @compileError("use std.Io instead");
-    } else if (native_os == .wasi and !builtin.link_libc) {
-        @compileError("use std.Io instead");
-    }
-    switch (errno(system.mkdirat(dir_fd, sub_dir_path, mode))) {
-        .SUCCESS => return,
-        .ACCES => return error.AccessDenied,
-        .BADF => unreachable,
-        .PERM => return error.PermissionDenied,
-        .DQUOT => return error.DiskQuota,
-        .EXIST => return error.PathAlreadyExists,
-        .FAULT => unreachable,
-        .LOOP => return error.SymLinkLoop,
-        .MLINK => return error.LinkQuotaExceeded,
-        .NAMETOOLONG => return error.NameTooLong,
-        .NOENT => return error.FileNotFound,
-        .NOMEM => return error.SystemResources,
-        .NOSPC => return error.NoSpaceLeft,
-        .NOTDIR => return error.NotDir,
-        .ROFS => return error.ReadOnlyFileSystem,
-        // dragonfly: when dir_fd is unlinked from filesystem
-        .NOTCONN => return error.FileNotFound,
-        .ILSEQ => return error.BadPathName,
-        else => |err| return unexpectedErrno(err),
-    }
-}
-
-pub const MakeDirError = std.Io.Dir.CreateDirError;
-
-/// Create a directory.
-/// `mode` is ignored on Windows and WASI.
-/// On Windows, `dir_path` should be encoded as [WTF-8](https://wtf-8.codeberg.page/).
-/// On WASI, `dir_path` should be encoded as valid UTF-8.
-/// On other platforms, `dir_path` is an opaque sequence of bytes with no particular encoding.
-pub fn mkdir(dir_path: []const u8, mode: mode_t) MakeDirError!void {
-    if (native_os == .wasi and !builtin.link_libc) {
-        return mkdirat(AT.FDCWD, dir_path, mode);
-    } else if (native_os == .windows) {
-        const dir_path_w = try windows.sliceToPrefixedFileW(null, dir_path);
-        return mkdirW(dir_path_w.span(), mode);
-    } else {
-        const dir_path_c = try toPosixPath(dir_path);
-        return mkdirZ(&dir_path_c, mode);
-    }
-}
-
 /// Same as `mkdir` but the parameter is null-terminated.
 /// On Windows, `dir_path` should be encoded as [WTF-8](https://wtf-8.codeberg.page/).
 /// On WASI, `dir_path` should be encoded as valid UTF-8.
 /// On other platforms, `dir_path` is an opaque sequence of bytes with no particular encoding.
-pub fn mkdirZ(dir_path: [*:0]const u8, mode: mode_t) MakeDirError!void {
-    if (native_os == .windows) {
-        const dir_path_w = try windows.cStrToPrefixedFileW(null, dir_path);
-        return mkdirW(dir_path_w.span(), mode);
-    } else if (native_os == .wasi and !builtin.link_libc) {
-        return mkdir(mem.sliceTo(dir_path, 0), mode);
-    }
-    switch (errno(system.mkdir(dir_path, mode))) {
-        .SUCCESS => return,
-        .ACCES => return error.AccessDenied,
-        .PERM => return error.PermissionDenied,
-        .DQUOT => return error.DiskQuota,
-        .EXIST => return error.PathAlreadyExists,
-        .FAULT => unreachable,
-        .LOOP => return error.SymLinkLoop,
-        .MLINK => return error.LinkQuotaExceeded,
-        .NAMETOOLONG => return error.NameTooLong,
-        .NOENT => return error.FileNotFound,
-        .NOMEM => return error.SystemResources,
-        .NOSPC => return error.NoSpaceLeft,
-        .NOTDIR => return error.NotDir,
-        .ROFS => return error.ReadOnlyFileSystem,
-        .ILSEQ => return error.BadPathName,
-        else => |err| return unexpectedErrno(err),
-    }
-}
-
-/// Windows-only. Same as `mkdir` but the parameters is WTF16LE encoded.
-pub fn mkdirW(dir_path_w: []const u16, mode: mode_t) MakeDirError!void {
-    _ = mode;
-    const sub_dir_handle = windows.OpenFile(dir_path_w, .{
-        .dir = Io.Dir.cwd().handle,
-        .access_mask = .{
-            .STANDARD = .{ .SYNCHRONIZE = true },
-            .GENERIC = .{ .READ = true },
-        },
-        .creation = .CREATE,
-        .filter = .dir_only,
-    }) catch |err| switch (err) {
-        error.IsDir => return error.Unexpected,
-        error.PipeBusy => return error.Unexpected,
-        error.NoDevice => return error.Unexpected,
-        error.WouldBlock => return error.Unexpected,
-        error.AntivirusInterference => return error.Unexpected,
-        error.OperationCanceled => return error.Unexpected,
-        else => |e| return e,
-    };
-    windows.CloseHandle(sub_dir_handle);
-}
-
 pub const ChangeCurDirError = error{
     AccessDenied,
     FileSystem,
diff --git a/lib/std/posix/test.zig b/lib/std/posix/test.zig
index 6b56f01709..d79dc547c3 100644
--- a/lib/std/posix/test.zig
+++ b/lib/std/posix/test.zig
@@ -527,7 +527,7 @@ test "rename smoke test" {
         // Create some directory
         const file_path = try Dir.path.join(gpa, &.{ base_path, "some_dir" });
         defer gpa.free(file_path);
-        try posix.mkdir(file_path, mode);
+        try Io.Dir.createDirAbsolute(io, file_path, .fromMode(mode));
 
         // Rename the directory
         const new_file_path = try Dir.path.join(gpa, &.{ base_path, "some_other_dir" });