- Rabbi Harold H. Gordon Papers (10)
- Rachel Davis DuBois Papers (32)
- Ralf William and Elsbeth (ne Müller) Adams Papers (6)
- Ralph and Ruth Tefferteller Papers (4)
- Rare Books and Manuscripts (12)
- Records of Local Young Men's Christian Associations (1)
- Records of ReconcilingWorks - Lutherans for Full Participation (175)
- Records of YMCA International Work in China (1104)
- Records of YMCA International Work in Greece (295)
- Records of YMCA International Work in Hong Kong (141)
- Records of YMCA International Work in Korea (110)
- Records of YMCA International Work in Palestine and Israel (709)
- Records of YMCA International Work in Russia and the Soviet Union (3)
- Records of YMCA International Work in the Philippines (8)
- Records of YMCA Work in England and the United Kingdom (605)
- Records of YMCA Work with American Indians (68)
- 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 D. Cooper China Diary and Other Papers (1)
- Richard Maurice Elliott Papers (282)
- Robert McBurney Papers (1)
- Romanian American Collection (1)
- Russell N. Service Papers (5)
