CDAI may refer to:

• Crohn's Disease Activity Index
• Cartilage-derived angiogenesis inhibitor

• NCAA Division I Men's Basketball Tournament
• NCAA Division I Men's Golf Championships
• NCAA Division I Men's Soccer Tournament
• NCAA Division I sports at the University of Houston
• NCAA Division I Women's Basketball Tournament
• NCAA fencing team championship
• NCAA Final Four
• NCAA football
• NCAA Football 06
• NCAA Football 2005
• NCAA Football 2006
• NCAA Football Championship (Philippines)
• NCAA General Championship
• NCAA history
• NCAA Lawn Tennis Championship
• NCAA March Madness series
• NCAA March Madness Series
• NCAA Men's Basketball Championship
• NCAA Men's Basketball Division I Championship
• NCAA Men's Cross Country Championship
• NCAA Men's Golf Championship
• NCAA Men's Gymnastics championship
• NCAA Men's Ice Hockey Championship
• NCAA Men's Indoor Track and Field Championship
• NCAA Men's Lacrosse Championship