Benjamin Schiff Platt (born September 24, 1993) is an American actor and singer. The son of film and theater producer Marc Platt and philanthropist Julie Platt, he began his acting career in musical theater as a child and appeared in productions of The Sound of Music (2006) and The Book of Mormon (2012–2015), rising to prominence for originating the title role in the Broadway coming-of-age musical Dear Evan Hansen (2015–2017). His performance in the latter earned him multiple accolades, including the Tony Award for Best Actor in a Leading Role in a Musical (making him the youngest solo recipient of the award at the time), a Daytime Emmy, and a Grammy Award. Platt reprised the role of Evan Hansen in the 2021 film adaptation of the musical, produced by his father. He then played Leo Frank in the 2022 New York City Center Gala production of Parade, which transferred to Broadway in 2023 and earned him another Tony nomination and another Grammy nomination.

Platt's film credits include the Pitch Perfect film series (2012–2017), Ricki and the Flash (2015), Run This Town (2019), and Theater Camp (2023), the latter of which he also co-wrote. Since 2019, he has starred in the Netflix comedy-drama series The Politician, for which he was nominated for a Golden Globe Award.

Platt signed with Atlantic Records in 2017 and released his debut studio album Sing to Me Instead in March 2019. In May 2020, the concert film Ben Platt Live from Radio City Music Hall debuted on Netflix. Platt's second studio album Reverie was released on August 13, 2021. After signing with Interscope in 2023, Platt's third studio album Honeymind was released on May 31, 2024.

In 2017, Platt was included on the annual Time 100 list of the most influential people in the world.