Alexandra Gersten-Vassilaros (born 1960) is an American playwright and actress. She is the co-author, with Theresa Rebeck, of Omnium Gatherum which was a finalist for the 2004 Pulitzer Prize for Drama.
Gersten-Vassilaros is a graduate of NYU's Tisch School of the Arts. She is a member of Actors Studio and HB Playwrights Foundation. She is a niece of theatrical producer Bernard Gersten.