San Mateo, Spanish for Saint Matthew, is the name for many places:
Bolivia
San Matéo River
San Matéo River (Ichilo River)
Canary Islands
Vega de San Mateo, a municipality on the island of Gran Canaria, Las Palmas province
Colombia
San Mateo, Boyacá
San Mateo (TransMilenio), a bus station in Bogotá
Costa Rica
San Mateo (canton), a canton in the province of Alajuela
San Mateo de Alajuela, a city and district in the canton
Guatemala
San Mateo, Quetzaltenango
San Mateo Ixtatán, in Huehuetenango
Mexico
State of Mexico
San Mateo Atenco
San Mateo Mexicaltzingo
Oaxaca
San Mateo Cajonos
San Mateo del Mar
San Mateo Etlatongo
San Mateo Nejapam
San Mateo Peñasco
San Mateo Piñas
San Mateo Río Hondo
San Mateo Sindihui
San Mateo Tlapiltepec
San Mateo Yoloxochitlán
Puebla
San Mateo Ozolco
Peru
San Mateo de Otao District
San Mateo District, Huarochirí
Philippines
San Mateo, Isabela
San Mateo, Rizal
San Mateo, San Pablo
Spain
San Mateo (Cantabria), a village of the municipality of the Los Corrales de Buelna, Cantabria
United States
San Mateo County, California
San Mateo, California
San Mateo, Florida
San Mateo, New Mexico
San Mateo (Santurce), Puerto Rico
Venezuela
San Mateo, Anzoátegui
San Mateo, Aragua
Other uses
San Mateo (water), a brand of bottled water sold in Peru