- Rabbi Harold H. Gordon Papers (10)
- Rachel Davis DuBois Papers (13)
- Ralf William and Elsbeth (ne Müller) Adams Papers (6)
- Ralph and Ruth Tefferteller Papers (4)
- Rare Books and Manuscripts (12)
- Records of YMCA International Work in China (1104)
- Records of YMCA International Work in Greece (294)
- Records of YMCA International Work in Hong Kong (141)
- Records of YMCA International Work in Palestine and Israel (709)
- Records of YMCA International Work in the Philippines (8)
- Records of YMCA Work in England and the United Kingdom (429)
- Records of the YMCA of the City of New York (5)
- Resort Discrimination Records (66)
- Rev. Kenneth Dexter Miller Papers (139)
- Richard C. Morse Papers (3)
- Richard Maurice Elliott Papers (282)
- Romanian American Collection (1)
- Russell N. Service Papers (5)
