The 2025–26 Big 12 men's basketball season began with the start of the 2025–26 NCAA Division I men's basketball season on November 3, 2025. Regular season conference play started on January 2, 2026 and concluded on March 7, 2026. The 2026 Big 12 men's basketball tournament was held on March 10−14, 2026, at the T-Mobile Center in Kansas City, Missouri.
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