B
James P. Bagian, M.D. — STS-29, STS-40
Ellen S. Baker, M.D. — STS-34, STS-50, STS-71
Michael Baker — STS-43, STS-52, STS-68, STS-81
Aleksandr Balandin — Soyuz TM-9
Michael R. Barratt, M.D. — Soyuz TMA-14, STS-133
Daniel Barry — STS-72, STS-96, STS-105
John-David F. Bartoe — STS-51-F
Charlie Bassett (1931–1966) — No flights. Originally assigned to Gemini 9.
Yuri Baturin — Soyuz TM-28/27, Soyuz TM-32/31
Patrick Baudry — STS-51-G
Alan Bean — Apollo 12, Skylab 3
Robert L. Behnken — STS-123, STS-130
Ivan Bella — Soyuz TM-29/28
Pavel Belyayev (1925–1970) — Voskhod 2
Georgi Beregovoi (1921–1995) — Soyuz 3
Anatoli Berezovoy — Soyuz T-5/7
John Blaha — STS-29, STS-33, STS-43, STS-58, STS-79/81
Michael J. Bloomfield — STS-86, STS-97, STS-110
Guion Bluford — STS-8, STS-61-A, STS-39, STS-53
Karol Bobko — STS-6, STS-51-D, STS-51-J
Eric A. Boe — STS-126, STS-133
Charles Bolden— STS-61-C, STS-31, STS-45, STS-60
Roberta Bondar, M.D. — STS-42
Valentin Bondarenko (1937–1961) - no flights. Died in fire while training in pure oxygen (three weeks before Gagarin's flight).
Andrei Borisenko — Soyuz TMA-21
Frank Borman — Gemini 7, Apollo 8
Stephen G. Bowen — STS-126, STS-132, STS-133
Kenneth Bowersox — STS-50, STS-61, STS-73, STS-82, STS-113/Soyuz TMA-1
Charles E. Brady, Jr., M.D. (1951–2006) — STS-78
Vance Brand — Apollo-Soyuz Test Project, STS-5, STS-41-B, STS-35
Daniel Brandenstein — STS-8, STS-51-G, STS-32, STS-49
Randolph Bresnik – STS-129
Roy Bridges — STS-51-F
Curtis Brown — STS-47, STS-66, STS-77, STS-85, STS-95, STS-103
David M. Brown (1956–2003) — STS-107. Died on the Columbia
Mark Brown — STS-28, STS-48
James Buchli — STS-51-C, STS-61-A, STS-29, STS-48
Jay C. Buckey, M.D. — STS-90
Nikolai Budarin — STS-71/Soyuz TM-21, Soyuz TM-27, STS-113/Soyuz TMA-1
John S. Bull (1934–2008) — No flights.
Daniel Burbank — STS-106, STS-115, Soyuz TMA-22
Daniel Bursch — STS-51, STS-68, STS-77, STS-108, STS-111
Valery Bykovsky — Vostok 5, Soyuz 22, Soyuz 31/29Read more about this topic: List Of Astronauts By Name