Rider King Strong (born December 11, 1979) is an American actor, producer, director, and screenwriter. He is best known for starring as Shawn Hunter on the ABC sitcom Boy Meets World (1993–2000), which he reprised in its sequel series Girl Meets World (2014–2017). He also headlined the cult classic Cabin Fever (2002) and co-wrote and directed the independent film Irish Twins (2008) with his brother Shiloh. He provided the voices of Brick Flagg in Kim Possible (2002–2004) and Kim Possible Movie: So the Drama (2005), and Tom Lucitor in Star vs. the Forces of Evil (2015–2019). In 2015, Strong was honored with the Young Artist Former Child Star Lifetime Achievement Award.

Strong was born in San Francisco, California, the second of two boys born to Lin (née Warner), a teacher and nutritionist, and King Arthur Strong, a firefighter, who are both originally from Pennsylvania. He has English and Irish ancestry. He graduated from Nonesuch School in Sebastopol, California in 1998. His elder brother is Shiloh Strong, an actor and photographer.

Strong attended morning classes at Occidental College while still filming for Boy Meets World, accumulating a year's worth of credit before the series ended. In 2004, Strong graduated magna cum laude from Columbia University as an English major. He completed his Master of Fine Arts in fiction and literature in June 2009 at Bennington College.

Strong began his acting career at the age of nine, when he starred as Gavroche in the San Francisco production of Les Misérables, alongside Larisa Oleynik as Young Cosette. After the stage production, he appeared in small screen roles on television.

In 1992, Strong received his first regular television series role as Adam MacGuire on Julie. When the series was canceled, Strong made his debut on film, in 1993, as Amy Irving's son in Benefit of the Doubt. It was not until he was chosen for the role of Shawn Hunter in the ABC series Boy Meets World that he received widespread recognition. During the seven-year run, he was nominated twice for the Young Artist Award and nominated once for The Hollywood Reporter YoungStar Award. He found it difficult coping with his newfound fame, citing at least one breakdown at 15 when he was on a "Sail With the Stars" charity cruise. However, in a later interview, Strong also stated that he was inconsiderate with his power, having previously set up weekly six hour roundtrip commutes back to Sonoma with his mother and brother.

Strong permanently moved to Los Angeles at 16 and later attended morning classes at Occidental College. After Boy Meets World ended in 2000, he moved to New York to attend Columbia University. At that time, actors Joseph Gordon-Levitt, Julia Stiles, and Anna Paquin were all registered students at the university. Strong took one semester off to star as Paul in the indie horror film Cabin Fever (2002), directed by Eli Roth. He took another semester off to star in a Broadway production of The Graduate, opposite Jerry Hall as Mrs. Robinson.

In 2006, Strong returned to television for a regular series role in Pepper Dennis on The WB. The show was short-lived and was not chosen as one of the transferring shows to The CW. That same year, Strong recorded a reading for the audio version of the Anthony Kiedis biography Scar Tissue. He had a brief cameo appearance in 2009's Cabin Fever 2: Spring Fever, the sequel to Cabin Fever.

Along with his brother Shiloh, Strong wrote and directed the short film Irish Twins, which premiered at the 2008 Tribeca Film Festival. It went on to win both the Jury Award and Audience Award at the Woods Hole Film Festival, a Special Jury Prize in the Action/Cut Short Film Competition and Best First-Time Director at DC Shorts. Speaking to Pure Movies in 2010, he expressed that he wanted to expand his writing and directing career: "Acting is always there and I enjoy it but it's kind of got a little unfulfilling lately. You know, I'm in the low-budget horror world. ... I have a whole lot of other stuff I want to do."