William "Bill" Adama is a fictional character in the re-imagined Battlestar Galactica television series produced and aired by the SyFy cable network. He is one of the main characters in the series and is portrayed by Edward James Olmos. The character is a reimagining of Commander Adama from the 1978 Battlestar Galactica series, originally played by Lorne Greene.

Battlestar Galactica (BSG) is an American military science fiction television series, and part of the Battlestar Galactica franchise. The show was developed by Ronald D. Moore and executive produced by Moore and David Eick as a re-imagining of the 1978 Battlestar Galactica television series created by Glen A. Larson. The pilot for the series first aired as a three-hour miniseries in December 2003 on the Sci-Fi Channel, which was then followed by four regular seasons, ending its run on March 20, 2009. The cast includes Edward James Olmos, Mary McDonnell, Katee Sackhoff, Jamie Bamber, James Callis, Tricia Helfer, and Grace Park.