Robert B. Capron Jr. is an American actor. He is best known for starring as Rowley Jefferson, Greg Heffley's best friend, in the first three installments of the Diary of a Wimpy Kid film series. More recently, Capron is known for starring as Mason in the drama series Elementary, and as David Lewan in the film The Polka King.

Diary of a Wimpy Kid is a series of family comedy films based on the book series of the same name by Jeff Kinney. The series consists of four live action films and three animated films.