Dennis Hopper (born May 17, 1936, Dodge City, Kansas, U.S.—died May 29, 2010, Los Angeles, California) was an American film actor, director, and writer who rose to fame as a countercultural icon in the 1960s and later developed into a noted character actor.

When Hopper was a teenager, his family settled in San Diego, California, where he began performing at the Old Globe Theatre. He moved to Los Angeles following high school and, after signing with Warner Brothers, quickly secured his first significant film role in Rebel Without a Cause (1955), opposite Natalie Wood and James Dean. Despite tales of his temperamental on-set antics, Hopper was then cast in a string of films, including Giant (1956), also opposite Dean, and The Story of Mankind (1957). However, by 1958 his difficult behaviour had become a liability and Warner Brothers dropped him. He subsequently moved to New York City to study at the Actors Studio.

Throughout the 1960s Hopper appeared in features of varying quality, from horror films such as Night Tide (1961) to Cool Hand Luke (1967), a classic prison drama starring Paul Newman. However, it was his directorial debut—the drug-fueled motorcycle drama Easy Rider (1969), in which he starred alongside Peter Fonda—that established Hopper as a talent of note and situated him at the forefront of the burgeoning resistance to the status quo. He, Fonda, and writer Terry Southern earned an Academy Award nomination for their screenplay. However, his substance abuse and erratic behaviour overshadowed his work in the following decade, and studios balked at casting him. He rallied sufficiently to play an addled photojournalist in Francis Ford Coppola’s Apocalypse Now (1979).

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By the mid-1980s Hopper, having overcome his addictions, had engineered a career resurgence. In 1986 he appeared in director David Lynch’s Blue Velvet as the sadistic Frank Booth and in Hoosiers as the alcoholic assistant coach of a small-town basketball team; the latter performance earned him an Academy Award nomination for best supporting actor. Later work included turns as the villain in Speed (1994) and a poet in Elegy (2008).

Hopper made numerous television appearances throughout his career, notably earning an Emmy Award nomination for the television movie Paris Trout (1991), in which he played the bigoted title character. He appeared as a Serbian war criminal on the television series 24 in 2002, and he later portrayed a music producer in the series Crash (2008–09).

Hopper attained additional renown for his photography, which documented his relationships with artists from Jasper Johns to Andy Warhol, and for his paintings, composed in a range of styles. A major retrospective of his work was staged at the Stedelijk Museum in Amsterdam in 2001.