S mode may refer to: S mode (photography), shutter priority mode in electronically controlled camera S-mode 1, 1st single compilation album by Masami Okui S-mode 2, 2nd single compilation album by Masami Okui S-mode 3, 3rd single compilation album by Masami Okui Mode S, an aviation transponder interrogation mode Windows 10 S Mode (also in Windows 11), a variant of the Windows operating system