San Juan, the Spanish for Saint John, is a common toponym in parts of the world where Spanish is or was spoken:

• Argentina
  • San Juan Province
  • San Juan, Argentina, the capital of that province

• Cuba
  • San Juan Hill

• Mexico
  • San Juan, Campeche
  • San Juan, Chihuahua
  • San Juan, Coahuila
  • San Juan, San Luis Potosí
  • San Juan, Sonora

• Philippines
  • San Juan, Metro Manila

• Puerto Rico
  • San Juan, Puerto Rico, the capital of the Commonwealth of Puerto Rico

• Trinidad and Tobago
  • San Juan

• United States
  • San Juan, New Mexico
  • San Juan River/Basin, New Mexico
  • San Juan, Texas
  • San Juan County, Colorado
  • The San Juan Mountains (in the state of Colorado)
  • The San Juan Islands (off the coast of the state of Washington)

Additional uses:

• San Juan by Andreas Seyfarth : A card game for three to four players.