Calahan O'Reilly (born September 30, 1986) is a Canadian professional ice hockey forward who is currently under contract to the Lehigh Valley Phantoms of the American Hockey League (AHL). O'Reilly's younger brother Ryan plays with the St. Louis Blues.
After playing the majority of his contract with the Wild as captain of the Iowa Wild in the AHL, O'Reilly left as a free agent to continue in the AHL by signing a two-year deal with the Lehigh Valley Phantoms, affiliate to the Philadelphia Flyers, on July 1, 2019.