Tele San Marcos

 is a Guatemalan TV channel launched in 1980 and owned by RGN Holdings Ltd.

During much of the 1980's, TSM was the biggest competitor to, and  in Guatemala and had near-fierce competition with Mexico's , , , and.

History
The first show transmitted was Una nueva marca de televisión hosted by network founder Ramón Borrell Arruabarrena. At first, it broadcast out of in the  of  and could only be received in  in  and the surrounding area. Soon stations in the rest of and two areas of  (the first area being comprised of Chiapas,, , , , ,  - and the other area being solely ) were added quickly.