The 2009–2010 season of the British Basketball League (BBL) was the 23rd season since the league's establishment in 1987. The regular season commenced on 25 September 2009, when Milton Keynes Lions claimed the first win of the season with a 94–81 victory in the opening game against Worcester Wolves. A total of 13 teams took to the court including new start-up franchise Essex Pirates, which was founded by Great Britain Under 20s coach Tim Lewis, and a newly rebranded Rocks team carrying the name of the city of Glasgow instead of their previous Scottish Rocks title.