The 2008–09 Arizona State Sun Devils men's basketball team represented Arizona State University during the 2008–09 NCAA Division I men's basketball season.

The Sun Devils played their home games at the Wells Fargo Arena and are members of the Pacific-10 Conference.

The Sun Devils finished with 25–10, 11–7 in Pac-10 play and lost the championship game of the 2009 Pacific-10 Conference men's basketball tournament to USC.

They earned a trip to the 2009 NCAA Division I men's basketball tournament, where they lost to Syracuse in the second round.

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