The O.C. is an American teen drama television series created by Josh Schwartz that originally aired on Fox in the United States from August 5, 2003, to February 22, 2007, with a total of four seasons consisting of 92 episodes. The series title, "O.C.", is an initialism of Orange County, the location in Southern California in which the series is set.

The series centers on Ryan Atwood, a troubled and gifted young man from a broken home who is adopted by the wealthy and philanthropic Sandy and Kirsten Cohen. Ryan and his adoptive brother Seth, a socially awkward, quick-witted teenager, deal with life as outsiders in the high-class world of Newport Beach. Ryan and Seth spend much time navigating their relationships with girl-next-door Marissa Cooper, Seth's childhood crush Summer Roberts, and the fast-talking loner Taylor Townsend. Storylines deal with the culture clash between the idealistic Cohen family and the shallow, materialistic, and closed-minded community in which they reside. The series includes elements of postmodernism, and functions as a mixture of melodrama and comedy.

The series premiered with high ratings and was one of the most popular new dramas of the 2003–2004 television season. It was widely referred to as a pop cultural phenomenon and received mostly positive reception from critics. However, ratings declined as the show went on. The low ratings led to its cancellation in early 2007.

The O.C. has been broadcast in more than 50 countries worldwide. The series has also been released on DVD as well as on iTunes and streaming services Hulu and Max.