The third season of the fantasy drama television series Game of Thrones premiered in the United States on HBO on March 31, 2013, and concluded on June 9, 2013. It was broadcast on Sunday at 9:00 pm in the United States, consisting of 10 episodes, each running approximately 50–60 minutes. The season is based roughly on the first half of A Storm of Swords. The series is adapted for television by David Benioff and D. B. Weiss. HBO renewed the series for a third season on April 10, 2012, nine days after the second season's premiere. Production began in July 2012. The show was filmed primarily in Ireland, Northern Ireland, Croatia, Iceland and Morocco.

A Storm of Swords is the third of seven planned novels in A Song of Ice and Fire, a fantasy series by American author George R. R. Martin. It was first published on August 8, 2000, in the United Kingdom, with a United States edition following in November 2000. Its publication was preceded by a novella called Path of the Dragon, which collects some of the Daenerys Targaryen chapters from the novel into a single book.