The blue-capped hummingbird or Oaxaca hummingbird (Eupherusa cyanophrys) is a species of hummingbird. It is endemic to subtropical moist forest in the southernmost part of the Sierra Madre del Sur in the Mexican state of Oaxaca. Its tiny range is threatened by habitat loss.
Like the White-tailed hummingbird, it is sometimes thought to be a subspecies of the more common Stripe-tailed hummingbird.