2009–10 Eurocup Basketball was the eighth edition of Europe's second-tier level transnational competition for men's professional basketball clubs, the EuroCup. The EuroCup is the European-wide league level that is one tier below the EuroLeague level. It began with qualifying round matches on October 20, 2009, and ended with the Eurocup Finals on April 17 and 18, 2010, at Fernando Buesa Arena in Vitoria-Gasteiz, Basque Country, Spain. The competition was won by Spanish club Power Electronics Valencia, who won their second EuroCup title, and also secured a place in the 2010–11 edition of the EuroCup's parent competition, the EuroLeague.