The 2008–09 Old Dominion Monarchs basketball team represented Old Dominion University in National Collegiate Athletic Association (NCAA) Division I men's basketball during the 2008–09 season. Playing in the Colonial Athletic Association (CAA) and led by eighth-year head coach Blaine Taylor, the Monarchs finished the season with a 25–10 overall record and won the 2009 CollegeInsider.com Postseason Tournament – the first year of the tournament's existence.