Mark A. Tatum (born October 22, 1969) is an American sports and business executive who is currently serving as the Deputy Commissioner of the National Basketball Association (NBA) under Adam Silver.

[5] Tatum attended Cornell University, where he played collegiate baseball for the Big Red, was a member of the Quill and Dagger society, and was initiated into the Kappa Alpha Psi fraternity.

Prior to becoming Deputy Commissioner, he worked as the league's Executive Vice President of Global Marketing Partnerships, where he managed the Business Development and Media groups.

In this role, he collaborated with sports marketing executives from the Coca-Cola Company, Anheuser-Busch InBev, Adidas, and Nike, among others, being in charge of NBA-themed promotions and advertising.

On February 1, 2014, Tatum was unanimously appointed Deputy Commissioner and chief operating officer by the NBA Board of Governors.