Jack Alcott (born March 15, 1999) is an American actor and model. He is best known for two roles on Showtime: Jason Brown in the miniseries "The Good Lord Bird" and Harrison Morgan in the series "Dexter: New Blood."

Alcott grew up in Franklin, Tennessee. He lived in New York for a time, living the life of a "struggling actor," but returned home when the COVID-19 pandemic began.

Alcott appeared in several short films before landing his first television role—young Zach Chevalier in the series "Champaign ILL." In 2020, he appeared as a young Donald Ressler in an episode of "The Blacklist."

Alcott's first regular role was Jason Brown in the Showtime miniseries "The Good Lord Bird" (2020). He then played Harrison Morgan, now a teenager and the son of Dexter Morgan, in the Showtime series "Dexter: New Blood" (2021–2022)—a miniseries revival of the original series "Dexter"—as well as in the subsequent spin-off/continuation "Dexter: Resurrection" (2025).