Felix Aguilar Observatory or Observatorio Félix Aguilar is an astronomical observatory in Argentina. It is located in the Reserva Natural El Leoncito in San Juan Province.

It is named after Félix Aguilar (1884–1943), an Argentinian astronomer and engineer who was director of the Observatorio de La Plata from 1919–1921 and again from 1934 until his death.