Ulong may refer to:
- Ulong Island, in the Republic of Palau in the Pacific Ocean, sometimes called Aulong and originally written Oroolong in English.
- Ulong channel, a gap in the reef to the west of Ulong Island, popular with divers.
- Ulong, New South Wales, a small town in Australia lying inland from Coffs Harbour.
- Ulong, a tribe in Survivor: Palau, the tenth season, set in Palau, of the American TV series Survivor.
- Ulong is an unsigned long integer datatype in computer programming languages.
- ulong tea is an alternate spelling for oolong tea..
- ulong is a type defined in Linux as a typedef for unsigned long.
- Ulong, a character in the anime franchaise Dragon Ball.