Cañas or Canas is a surname. Notable people with the surname include:
- Alberto Cañas Escalante, Costa Rican politician
- Antonio José Cañas, Salvadoran military officer, diplomat and politician
- Carlos Cañas, Salvadoran painter
- Guillermo Cañas, Argentinian professional tennis player
- Jorge Cañas, Salvadoran footballer
- José Cañas Ruiz-Herrera, Spanish footballer
- José MarÃÂa Cañas, Costa Rican military officer and politician
- José MarÃÂn Cañas, Costa Rican journalist and writer
- Juan José Cañas, co-author of the National Hymn of El Salvador
- Juan José Cañas Gutiérrez, former Spanish footballer
- Ricardo Moreno Cañas, Costa Rican politician
- Vicente Cañas, Spanish Christian missionary and Jesuit brother