Mark Kellogg (March 31, 1831 – June 25, 1876) was a newspaper reporter killed at the Battle of the Little Bighorn. Kellogg rode with George Armstrong Custer during the battle and was evidently one of the first men killed by the Sioux and Cheyenne. His dispatches were the only press coverage of Custer and his men in the days leading up to the battle. As a newspaper stringer whose reports were picked up around the country, Kellogg is considered the first Associated Press correspondent to die in the line of duty.