Battlestar Galactica - All Seasons

The first season of the reimagined science fiction television series Battlestar Galactica, commissioned by the Sci-Fi Channel in February 2004, began airing eight months later in the United Kingdom and Ireland. It premiered on Sci-Fi in the United States with a two-hour debut on January 14, 2005. The first episode of the series received a Hugo Award and the season's 13 episodes were recognized with a Peabody Award "for pushing the limits of science fiction and making it accessible to all."

The second season of the reimagined science fiction television series Battlestar Galactica premiered on the Sci-Fi Channel in the United States on July 25, 2005, and concluded on March 10, 2006. The season was split into two parts, each containing 10 episodes. "Season 2.0" aired from July to September 2005, and "Season 2.5" aired from January to March 2006.

The third season of the reimagined science fiction television series Battlestar Galactica premiered on the Sci-Fi Channel in the United States on October 6, 2006, and concluded on March 25, 2007. Unlike the previous season, it was not split into two parts and did not have an extended hiatus during the middle of the season. The third season contained 20 episodes.

The fourth and final season of the reimagined science fiction television series Battlestar Galactica premiered on the Sci-Fi Channel in the United States on April 4, 2008, and concluded on March 20, 2009. Similar to the second season, it was split into two parts, each containing 10 episodes. "Season 4.0" aired from April to June 2008 and "Season 4.5" aired from January to March 2009. The fourth season contained 20 episodes, plus the television film Razor, which is considered the first two episodes of the season.