San Mateo, Spanish for Saint Matthew, is the name for many places:

Bolivia

San Matéo River

San Matéo River (Ichilo River)

San Mateo

Canada

San Mateo Bay, Vancouver Island, British Columbia

Canary Islands

Vega de San Mateo, Las Palmas

Colombia

San Mateo, Boyacá

Costa Rica

San Mateo (canton) San Mateo de Alajuela

San Mateo

Guatemala

San Mateo, Quetzaltenango

Mexico

State of Mexico

San Mateo Atenco

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

Peru

San Mateo de Otao District

San Mateo District, Huarochirí

Philippines

San Mateo, Isabela

San Mateo, Rizal

San Mateo, San Pablo

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

San Mateo