Liz Tuccillo is an American writer and producer best known for her work on the HBO comedy series Sex and the City and for co-authoring (with Greg Behrendt) the self-help book He's Just Not That Into You, for which they won a Quill Award.

Tuccillo wrote the 2005 television series Related,[2] which aired on the WB network.

Among its cast were Julie Dretzin, Michael Ealy, Dan Fogler, Michael Potts, Blake Robbins, Randy Ryan, and Callie Thorne.

[6] In 2002, Tuccillo's musical Cheyenne: A Transwestern premiered at the Hudson Theatre in Los Angeles.

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