CIAT may refer to:

• Chartered Institute of Architectural Technologists
• CIAT group that provides geothermal energy
• International Center for Tropical Agriculture
• Inter-American Center of Tax Administration

• 1905-06 Wisconsin Badgers men's basketball team
• 1905-06 Woolwich Arsenal F.C. season
• 1905-06 Yorkshire Cup
• 1905-1906 Costa Rican general election
• 1905-6 census of the Ottoman Empire
• 1905 AD
• 1905 Alabama Crimson White football
• 1905 Alabama Crimson White football season
• 1905 anti-Jewish pogroms
• 1905 Argentine Primera División
• 1905 Arizona football
• 1905 Arizona football season
• 1905 Arizona football team
• 1905 Arizona Varsity football team
• 1905 Arkansas Cardinals football
• 1905 Arkansas Cardinals football season
• 1905 Army Cadets football
• 1905 Army Cadets football season
• 1905 Auburn Tigers baseball team
• 1905 Auburn Tigers football
• 1905 Auburn Tigers football season
• 1905 Barcelona City Council election
• 1905 Baylor football
• 1905 Baylor football season
• 1905 Big Ten Conference football season