or conjoined twins are identical twins whose bodies are conjoined ''in utero''.
Siamese twins may also refer to:
* Chang and Eng Bunker
the "Siamese Twins", Siamese-American conjoined twin brothers from whom the term derives
* Irreversible binomial
, a pair or group of words used together in fixed order, such as ''fish and chips'' or ''null and void''
* NGC 4567 and NGC 4568
, two galaxies nicknamed the Siamese twins
* "Siamese Twins", a song from The Cure's 1982 album ''Pornography''
* A type of crossword
puzzle with two grids and two clues for each entry displayed together in random order
* Siamese (disambiguation)
* Siamese connection
, a pipe fitting that allows two or more fire hoses to be connected
* Dual-listed company
, a corporate structure in which two corporations function as a single operating business