List of Astronauts By Name - O

O

  • Bryan O'Connor — STS-61-B, STS-40
  • Ellen Ochoa — STS-56, STS-66, STS-96, STS-110
  • Wubbo Ockels — STS-61-A
  • William Oefelein — STS-116
  • Brian O'Leary — No flights
  • John D. Olivas — STS-117, STS-128
  • Takuya Onishi — No flights
  • Ellison Onizuka (1946–1986) — STS-51-C. Died on the Challenger (STS-51L).
  • Yuri Onufrienko — Soyuz TM-23, STS-108/111
  • Stephen Oswald — STS-42, STS-56, STS-67
  • Robert Overmyer (1936–1996) — STS-5, STS-51-B

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