Alexander Cesare Gemignani (born July 3, 1979) is a Broadway actor, tenor, musician, and conductor.

Gemignani is known for his roles in Broadway musicals, including Assassins, Sweeney Todd: The Demon Barber of Fleet Street, Les Misérables, Sunday in the Park with George, and Carousel, receiving a Tony Award nomination for the latter.

His film and television credits include The Producers, The Good Wife, Homeland, Chicago Fire, Empire, and The Marvelous Mrs. Maisel (recurring as Janusz, the eventual husband of the Weissmans’ maid, Zelda).

He made his conducting debut with the New York Philharmonic in Live from Lincoln Center's New Year's Eve: Celebrating Sondheim on December 31, 2019.

[5][6] He served as music director and orchestrator for the Fiasco Theatre production of Merrily We Roll Along.