Ocaria ocrisia, the Black Hairstreak or Hewitson's Blackstreak, is a butterfly of the Lycaenidae family. It was described by Hewitson in 1868. It is found from Mexico to Brazil, Paraguay, Peru, Ecuador and Argentina. It has also been recorded from southern Arizona. The habitat consists of rainforests at altitudes ranging from 200 to 900 meters. The wingspan is about 27 mm.