KDSR (101.1 FM, "101.1 Jack FM") is a radio station licensed to serve Williston, North Dakota. The station is owned by Marks Radio Group, and licensed to Williston Community Broadcasting Corp. (dba KDSR-FM). It airs an Adult Hits music format.
The station studios are at 910 E Broadway in Williston.
The station was assigned the KDSR call letters by the Federal Communications Commission on August 30, 1984.