- Baba Freeman Reston, Virginia collection, 1966/20072
- Barbara Lustbader New York City playbills collection, 1957/201227
- Bernard Brenner brass rubbings collection1
- Bernard Rosenblatt Regional Theatre Council for Northern California and Nevada papers, 1938/19798
- Black and white photograph of George Balanchine rehearsing two ballet dancers by Costas, 1970/19801
- Bonnie Atwood papers, 1965/19963
- Broadside student newspaper collection, 1963/20201
- Broadway souvenir theatre programs collection, 1942/19974
- C-SPAN records, 1809/2012, bulk 1978/20125
- C. Harrison Mann, Jr. papers, 1832/197912
- Carol D. Litchfield microbiology collection33
- Carol R. Lubin papers, 1960/19816
- Charles A. Veatch papers, 1970/20042
- Charles Baptie photograph collection31
- Charles Lietwiler transportation collection, 1903/200523