Alegre River

Alegre River may refer to:

Brazil

 * Alegre River (Espírito Santo)
 * Alegre River (Goiás)
 * Alegre River (Guaporé)
 * Alegre River (Maranhão)
 * Alegre River (Mato Grosso)
 * Alegre River (Paraná)
 * Alegre River (Rio de Janeiro)

Mexico

 * Alegre River (Mexico)

Venezuela

 * Alegre River (Venezuela)