| XHSO-FM | |
| Country: | MX |
| Branding: | La Mejor |
| Airdate: | April 25, 1969 (concession) |
| Frequency: | 99.9 MHz |
| Format: | Regional Mexican |
| Erp: | 50 kW |
| Coordinates: | 21.1232°N -101.6889°W |
| Sister Stations: | XHMD-FM |
| Owner: | MVS Radio |
| Licensee: | Stereorey México, S.A. |
XHSO-FM is a radio station on 99.9 FM in León, Guanajuato, Mexico. The station is owned by MVS Radio and carries its La Mejor Regional Mexican format.
XHSO received its first concession on April 25, 1969. It has always been owned by MVS through several different concessionaires. It signed on broadcasting Stereorey, a contemporary music format in English. On September 2, 2002, the Stereorey format ended to give way to Best FM; on March 5, 2005, it became La Mejor with grupera music.