- Reconstruction of House Roofs and Skylights, Special Committee on, House1
- Reconstruction of Senate Roof and Skylights, Special Committee on, Senate1
- Recruiting Bureau1
- Reduction of Nonessential Federal Expenditures Joint Committee1
- Reorganization of Courts of United States and Reform Judicial Procedure, Special Committee to Study, Senate1
- Rock Creek Valley Parkway Commission1
- Senate Contingent Expenses Committee, Senate1
- Senate Contingent Expenses, Committee to Audit and Control, Senate1
- Senatorial Campaign Expenditures and Use of Governmental Funds in 1938, Special Committee to Investigate, Senate1
- Senatorial Campaign Expenditures in 1942, Special Committee to Investigate, Senate1
- Ship Subsidy Lobby, Alleged, Select Committee to Investigate1
- Sims, Thetus W., Select Committee to Investigate Alleged Assault upon, by Charles C. Glover1
- Small Business, Permanent Select Committee on, House1
- Standards, Weights, and Measures Select Committee1
- Supplies and Shortages of Food, Particularly Meat, Select Committee To Investigate, House1
- Tax-Exempt Foundations and Comparable Organizations, Select Committee to Investigate, House1
- Telepost, Select Committee to Investigate use of, in Connection with Post Office Department1
- Tensions Committee1
- Tobacco Commission1
- Useless Papers and Documents Select Committee1