Alien Tablets may refer to:
- Purple Tablet, a tablet found in multiple places and required to open many doors.
- Orange Tablet, a tablet used exclusively to unlock the Lost River Laboratory Cache.
- Blue Tablet, a tablet used to access the Primary Containment Facility.
- Red Tablet, a cut tablet with a red symbol resembling an R. (unused)
- White Tablet, a cut tablet with a white symbol resembling a T. (Used in below zero)