Matthew David Lewis (born 27 June 1989) is an English actor. He is best known for his role as Neville Longbottom in the Harry Potter film series.

Born in Leeds, Lewis made his acting debut in Some Kind of Life (1995), guest-starring on dramas for ITV and BBC One before appearing in Harry Potter and the Philosopher's Stone (2001). Lewis played the role for ten years, concluding with the final film, Harry Potter and the Deathly Hallows – Part 2 (2011), for which he received critical praise. Following the series, Lewis reoccured in The Syndicate and performed his first theatre role in Our Boys at the Duchess Theatre in 2012.

Lewis starred in The Rise (2012) which premiered at the Toronto International Film Festival to positive reviews and made appearances on BBC dramas Bluestone 42 and Death in Paradise in 2013 and 2015, respectively. Lewis had a supporting role in Me Before You (2016), which became a box office success. He was cast in the crime dramas Ripper Street and Happy Valley before starring on the ITV drama Girlfriends in 2018. Lewis appeared in Terminal (2018), which premiered at the Edinburgh International Film Festival as well as Baby Done (2020). Since 2020, Lewis has starred in Channel 5 television series All Creatures Great and Small to critical praise.