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 María Cañas, Costa Rican military officer and politician José Marín 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