- Capitol Grounds, Commission for Enlarging of2
- Capitol Grounds, Commission on Enlarging1
- Capitol, Strength and Safety of Roofs over Senate and House Wings of, Special Joint Committee to Investigate2
- Censure Charges, Select Committee To Study, Senate3
- Census Committee54
- Census Committee, House31
- Centralization of Heavy Industry in United States, Special Committee to Investigate, Senate5
- Civil Service Committee39
- Civil Service Committee, House172
- Civil Service Committee, Senate192
- Civil Service Reform Committee46
- Civil Service Select Committee3
- Civil Service and Retrenchment Committee13
- Civil Service, Select Committee on Investigation of Illegal Appointments and Dismissals in, Senate1
- Civil-Service Laws, Special Committee to Investigate Administration and Operation of, Senate2
- Claims Committee4,002
- Claims Committee, House7,552
- Claims Committee, Senate6,170
- Coast and Insular Survey Committee2
- Coinage, Weights and Measures Committee78