Logan Wade Lerman (born January 19, 1992) is an American actor. He appeared in commercials in the mid-1990s, before starring in the series Jack & Bobby (2004–2005) and the movies The Butterfly Effect (2004) and Hoot (2006). Lerman gained further recognition for playing the title character in the Percy Jackson film series (2010–2013) and d'Artagnan in The Three Musketeers (2011), as well as for starring in the coming-of-age drama The Perks of Being a Wallflower (2012). He had major roles in the films Noah (2014), Fury (2014) and Indignation (2016), and returned to television with the thriller series Hunters (2020–2023).

Lerman was born in Beverly Hills, California. His mother, Lisa (née Goldman), works as his manager, and his father, Larry Lerman, is a businessman and orthotist. He has an older sister and an older brother.

Lerman is Jewish, and had a Bar Mitzvah ceremony. His grandparents were born in four different countries. His paternal grandfather, Max Lerman, was born in Berlin, in 1927, to a Polish Jewish family; they left Germany in the 1930s because of the Nazi regime, and lived in Shanghai until the end of World War II. His paternal grandmother, Mina (née Schwartz), was born in Mexico City, to Russian Jewish parents. His maternal grandfather was a Polish Jewish immigrant, and his maternal grandmother was born in Los Angeles, also to a Jewish immigrant family. On his mother's side he is a relative, by marriage, of twin singers Evan and Jaron Lowenstein.

Lerman has stated that he is a "black sheep" in his household because he is an actor, while most of his relatives work in the medical profession. His family owns and operates an orthotics and prosthetics company which was founded by his great-grandfather in 1915. He attended Beverly Hills High School. In 2010, he applied to study creative writing at New York University, but postponed his attendance.

Lerman had a passion for movies from a young age, though he started acting "just for fun" and "to do something to get out of school". He began auditioning for roles in the late 1990s, and first appeared in commercials. He made his film debut in 2000's The Patriot, playing William Martin, one of the lead character's children. The same year, he appeared in What Women Want. In 2001's Riding in Cars with Boys, he played the son of the main character. Lerman has stated that while appearing in his earliest roles as a child, he did not have "any conscious awareness of what I was doing or what was going on" and "didn't have a good experience".

In 2003, Lerman played nine-year-old Luke Chandler in the CBS made-for-television film A Painted House, based on the early life of author John Grisham and set in Black Oak, Arkansas in the early 1950s. A Painted House was filmed in Lepanto and Clarksdale, Mississippi, in 2002. A review in the Boston Globe described Lerman as a "promising newcomer" with the Telegraph-Herald commenting on the character having been "quietly and effectively played". For the role, he was nominated for the Young Artist Award for Best Performance by a Leading Young Actor in a television production, and tied with Calum Worthy for the win. He next appeared in the 2004 thriller film The Butterfly Effect, portraying a seven-year-old version of character Evan Treborn. digitallyOBSESSED's reviewer described Lerman as "definitely a child actor to watch".

Lerman had quit acting for a "year or so" in the early 2000s, when he was ten. He made a "conscious decision" to embrace acting as a profession when he was twelve, having developed an interest in the filmmaking process. In 2004, he was cast in the television series Jack & Bobby, playing one of the title roles, Robert "Bobby" McCallister, a 12-year-old "extremely bright social misfit" in Missouri who was destined to become President of the United States as an adult. The show ran on The WB Television Network during the 2004–2005 season, receiving some positive reviews but low ratings, and was subsequently canceled. Lerman was nominated for another Young Artist Award for his performance, tying with Jack DeSena for the win. Lerman has stated that he "started taking things seriously" about his career after appearing on the show. The Boston Herald's reviewer mentioned that Lerman's performance had a "blend of vulnerability and strength", while Entertainment Weekly's reviewer had noted that "Lerman lends Bobby a bedraggled optimism".

Continuing his film work, Lerman had his first starring role in a motion picture, playing Roy Eberhardt in the children's adventure Hoot; his character moves to Florida from Montana and attempts to save endangered burrowing owls. Lerman stated that the film's message is "that you can be any age and make a difference". Hoot began filming in July 2005 in South Florida, opened on May 5, 2006, and won him a third Young Artist Award, this time for Best Performance in a Feature Film – Leading Young Actor (2007). The Washington Post's reviewer commented that "Lerman shows some life as Roy" though his role was "an anomaly in a sea of insipidity", while the San Francisco Chronicle's reviewer disliked Lerman's performance.