Katherine Connella (born December 12, 1958 in Dallas, Texas) is an American actress and writer.

The initial idea for the screenplay of Transamerica occurred in a conversation between screenwriter/director Duncan Tucker and Katherine Connella. While discussing male/female perceptions, Connella shocked Tucker (they had been sharing a house for about four months at the time) with the revelation that she was intersex and had been raised as a male.

Cousin of model and actor Billy Connella.

Formerly a part of the comedy troupe Laphatax, with Sally Page Stuck and Steven Jay Crabtree.

Niece of country-and-western recording stars Buzz Busby and Red McCoy.

Cousin of actor David Connella

The germ of the idea of the screenplay "Transamerica", by Duncan Tucker, evolved one evening in late 1993. She and Tucker were sharing a house in Hollywood at the time and were having a debate on male/female perceptions. She stopped the debate cold when she revealed that she was a hermaphrodite and had been wrongly raised as a boy.