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|  | Rabaut, Louis Charles | D | MI | U.S. House | 1935 – 1961 |
| | Rabin, Benjamin J. | D | NY | U.S. House | 1945 – 1949 |
| | Race, John Abner | D | WI | U.S. House | 1965 – 1967 |
| | Radanovich, George P. | R | CA | U.S. House | 1995 – 2011 |
| | Radcliffe, George Lovic Pierce | D | MD | U.S. Senate | 1935 – 1947 |
| | Radel, Trey | R | FL | U.S. House | 2013 – 2014 |
| | Radwan, Edmund Patrick | R | NY | U.S. House | 1951 – 1959 |
| | Rahall, Nick J. II | D | WV | U.S. House | 1977 – 2015 |
| | Railsback, Thomas Fisher | R | IL | U.S. House | 1967 – 1983 |
| | Rains, Albert McKinley | D | AL | U.S. House | 1945 – 1965 |
| | Ramey, Homer Alonzo | R | OH | U.S. House | 1945 – 1949 |
| | Ramirez, Delia | D | IL | U.S. House | 2023 – 2025 |
| | Ramsay, Robert Lincoln | D | WV | U.S. House | 1949 – 1953 |
| | Ramspeck, Robert C. Word | D | GA | U.S. House | 1929 – 1945 |
| | Ramstad, Jim | R | MN | U.S. House | 1991 – 2009 |
| | Randall, William Joseph | D | MO | U.S. House | 1959 – 1977 |
| | Randolph, Jennings | D | WV | U.S. Senate | 1933 – 1985 |
| | Rangel, Charles B. | D | NY | U.S. House | 1971 – 2017 |
| | Rankin, John Elliott | D | MS | U.S. House | 1945 – 1953 |
| | Rarick, John Richard | D | LA | U.S. House | 1967 – 1975 |
| | Raskin, Jamie | D | MD | U.S. House | 2017 – 2025 |
| | Ratchford, William Richard | D | CT | U.S. House | 1979 – 1985 |
| | Ratcliffe, John | R | TX | U.S. House | 2015 – 2020 |
| | Ravenel, Arthur, Jr. | R | SC | U.S. House | 1987 – 1995 |
| | Ray, John Henry | R | NY | U.S. House | 1953 – 1963 |
| | Ray, Richard Belmont | D | GA | U.S. House | 1983 – 1993 |
| | Rayburn, Samuel Taliaferro | D | TX | U.S. House | 1945 – 1961 |
| | Rayfiel, Leo Frederick | D | NY | U.S. House | 1945 – 1947 |
| | Reams, Henry Frazier | I | OH | U.S. House | 1951 – 1955 |
| | Redden, Monroe Minor | D | NC | U.S. House | 1947 – 1953 |
| | Redlin, Rolland W. | D | ND | U.S. House | 1965 – 1967 |
| | Redmond, William Thomas | R | NM | U.S. House | 1997 – 1999 |
| | Reece, Brazilla Carroll | R | TN | U.S. House | 1933 – 1961 |
| | Reece, Louise Goff | R | TN | U.S. House | 1961 – 1963 |
| | Reed, Chauncey William | R | IL | U.S. House | 1935 – 1956 |
| | Reed, Clyde Martin | R | KS | U.S. Senate | 1939 – 1949 |
| | Reed, Daniel Alden | R | NY | U.S. House | 1919 – 1959 |
| | Reed, Jack | D | RI | U.S. Senate | 1991 – 2027 |
| | Reed, Tom | R | NY | U.S. House | 2010 – 2022 |
| | Rees, Edward Herbert | R | KS | U.S. House | 1945 – 1961 |
| | Rees, Thomas Mankell | D | CA | U.S. House | 1966 – 1977 |
| | Reeves, Albert Lee, Jr. | R | MO | U.S. House | 1947 – 1949 |
| | Regan, Kenneth Mills | D | TX | U.S. House | 1947 – 1955 |
| | Regula, Ralph | R | OH | U.S. House | 1973 – 2009 |
| | Rehberg, Denny | R | MT | U.S. House | 2001 – 2013 |
| | Reichert, Dave | R | WA | U.S. House | 2005 – 2019 |
| | Reid, Charlotte Thompson | R | IL | U.S. House | 1963 – 1973 |
| | Reid, Harry | D | NV | U.S. Senate | 1983 – 2017 |
| | Reid, Ogden Rogers | D | NY | U.S. House | 1963 – 1975 |
| | Reifel, Benjamin | R | SD | U.S. House | 1961 – 1972 |
| | Reinecke, Edwin | R | CA | U.S. House | 1965 – 1969 |
| | Renacci, James B. | R | OH | U.S. House | 2011 – 2019 |
| | Renzi, Rick | R | AZ | U.S. House | 2003 – 2009 |
| | Resa, Alexander John | D | IL | U.S. House | 1945 – 1947 |
| | Reschenthaler, Guy | R | PA | U.S. House | 2019 – 2025 |
| | Resnick, Joseph Yale | D | NY | U.S. House | 1965 – 1969 |
| | Reuss, Henry Schoellkopf | D | WI | U.S. House | 1955 – 1983 |
| | Revercomb, William Chapman | R | WV | U.S. Senate | 1943 – 1959 |
| | Reyes, Silvestre | D | TX | U.S. House | 1997 – 2013 |
| | Reynolds, Mel | D | IL | U.S. House | 1993 – 1995 |
| | Reynolds, Samuel Williams | R | NE | U.S. Senate | 1954 – 1954 |
| | Reynolds, Thomas M. | R | NY | U.S. House | 1999 – 2009 |
| | Rhodes, George Milton | D | PA | U.S. House | 1949 – 1969 |
| | Rhodes, John Jacob, III | R | AZ | U.S. House | 1987 – 1993 |
| | Rhodes, John Jacob | R | AZ | U.S. House | 1953 – 1983 |
| | Ribble, Reid | R | WI | U.S. House | 2011 – 2017 |
| | Ribicoff, Abraham Alexander | D | CT | U.S. Senate | 1949 – 1981 |
| | Rice, Kathleen | D | NY | U.S. House | 2015 – 2023 |
| | Rice, Tom | R | SC | U.S. House | 2013 – 2023 |
| | Rich, Carl West | R | OH | U.S. House | 1963 – 1965 |
| | Rich, Robert Fleming | R | PA | U.S. House | 1945 – 1952 |
| | Richards, James Prioleau | D | SC | U.S. House | 1945 – 1957 |
| | Richardson, Laura | D | CA | U.S. House | 2007 – 2013 |
| | Richardson, William Blaine | D | NM | U.S. House | 1983 – 1997 |
| | Richmond, Cedric L. | D | LA | U.S. House | 2011 – 2021 |
| | Richmond, Frederick William | D | NY | U.S. House | 1975 – 1983 |
| | Ricketts, Pete | R | NE | U.S. Senate | 2023 – 2025 |
| | Ridge, Thomas Joseph | R | PA | U.S. House | 1983 – 1995 |
| | Riegle, Donald Wayne, Jr. | D | MI | U.S. Senate | 1967 – 1995 |
| | Riehlman, Roy Walter | R | NY | U.S. House | 1947 – 1965 |
| | Rigell, Scott | R | VA | U.S. House | 2011 – 2017 |
| | Riggleman, Denver | R | VA | U.S. House | 2019 – 2021 |
| | Riggs, Frank D. | R | CA | U.S. House | 1991 – 1999 |
| | Riley, Corinne Boyd | D | SC | U.S. House | 1962 – 1963 |
| | Riley, John Jacob | D | SC | U.S. House | 1945 – 1962 |
| | Riley, Robert | R | AL | U.S. House | 1997 – 2003 |
| | Rinaldo, Matthew John | R | NJ | U.S. House | 1973 – 1993 |
| | Risch, Jim | R | ID | U.S. Senate | 2009 – 2027 |
| | Risenhoover, Theodore Marshall | D | OK | U.S. House | 1975 – 1979 |
| | Ritter, Donald Lawrence | R | PA | U.S. House | 1979 – 1993 |
| | Rivera, David | R | FL | U.S. House | 2011 – 2013 |
| | Rivers, Lucius Mendel | D | SC | U.S. House | 1941 – 1970 |
| | Rivers, Lynn Nancy | D | MI | U.S. House | 1995 – 2003 |
| | Rivers, Ralph Julian | D | AK | U.S. House | 1959 – 1966 |
| | Rizley, Ross | R | OK | U.S. House | 1945 – 1949 |
| | Robb, Charles S. | D | VA | U.S. Senate | 1989 – 2001 |
| | Roberts, Clint Ronald | R | SD | U.S. House | 1981 – 1983 |
| | Roberts, Herbert Ray | D | TX | U.S. House | 1962 – 1981 |
| | Roberts, Kenneth Allison | D | AL | U.S. House | 1951 – 1965 |
| | Roberts, Pat | R | KS | U.S. Senate | 1981 – 2021 |
| | Robertson, Absalom Willis | D | VA | U.S. Senate | 1933 – 1966 |
| | Robertson, Charles Raymond | R | ND | U.S. House | 1945 – 1949 |
| | Robertson, Edward Vivian | R | WY | U.S. Senate | 1943 – 1949 |
| | Robeson, Edward John, Jr. | D | VA | U.S. House | 1950 – 1959 |
| | Robinson, James Kenneth | R | VA | U.S. House | 1971 – 1985 |
| | Robinson, James William | D | UT | U.S. House | 1945 – 1947 |
| | Robinson, Tommy Franklin | R | AR | U.S. House | 1985 – 1991 |
| | Robison, Howard Winfield | R | NY | U.S. House | 1958 – 1975 |
| | Robsion, John Marshall, Jr. | R | KY | U.S. House | 1953 – 1959 |
| | Robsion, John Marshall | R | KY | U.S. House | 1945 – 1948 |
| | Roby, Martha | R | AL | U.S. House | 2011 – 2021 |
| | Rockefeller, Jay | D | WV | U.S. Senate | 1985 – 2015 |
| | Rockwell, Robert Fay | R | CO | U.S. House | 1945 – 1949 |
| | Rodgers, Robert Lewis | R | PA | U.S. House | 1945 – 1947 |
| | Rodino, Peter Wallace, Jr. | D | NJ | U.S. House | 1949 – 1989 |
| | Rodriguez, Ciro D. | D | TX | U.S. House | 1997 – 2011 |
| | Roe, Dudley George | D | MD | U.S. House | 1945 – 1947 |
| | Roe, James A. | D | NY | U.S. House | 1945 – 1947 |
| | Roe, Phil | R | TN | U.S. House | 2009 – 2021 |
| | Roe, Robert A. | D | NJ | U.S. House | 1969 – 1993 |
| | Roemer, Charles Elson (Buddy), III | D | LA | U.S. House | 1981 – 1988 |
| | Roemer, Tim | D | IN | U.S. House | 1991 – 2003 |
| | Rogan, James E. | R | CA | U.S. House | 1997 – 2001 |
| | Rogers, Byron Giles | D | CO | U.S. House | 1951 – 1972 |
| | Rogers, Dwight Laing | D | FL | U.S. House | 1945 – 1954 |
| | Rogers, Edith Nourse | R | MA | U.S. House | 1945 – 1961 |
| | Rogers, George Frederick | D | NY | U.S. House | 1945 – 1947 |
| | Rogers, Harold | R | KY | U.S. House | 1981 – 2025 |
| | Rogers, Mike | R | AL | U.S. House | 2003 – 2025 |
| | Rogers, Paul Grant | D | FL | U.S. House | 1955 – 1979 |
| | Rogers, Walter Edward | D | TX | U.S. House | 1951 – 1967 |
| | Rohrabacher, Dana | R | CA | U.S. House | 1989 – 2019 |
| | Rohrbough, Edward Gay | R | WV | U.S. House | 1947 – 1949 |
| | Rokita, Todd | R | IN | U.S. House | 2011 – 2019 |
| | Romney, Mitt | R | UT | U.S. Senate | 2019 – 2025 |
| | Ronan, Daniel John | D | IL | U.S. House | 1965 – 1969 |
| | Roncalio, Teno | R | WY | U.S. House | 1965 – 1979 |
| | Roncallo, Angelo Dominick | R | NY | U.S. House | 1973 – 1975 |
| | Rooney, Francis | R | FL | U.S. House | 2017 – 2021 |
| | Rooney, Frederick Bernard | D | PA | U.S. House | 1963 – 1979 |
| | Rooney, John James | D | NY | U.S. House | 1944 – 1975 |
| | Rooney, Tom | R | FL | U.S. House | 2009 – 2019 |
| | Roosevelt, Franklin Delano, Jr. | D | NY | U.S. House | 1949 – 1955 |
| | Roosevelt, James | D | CA | U.S. House | 1955 – 1965 |
| | Ros-Lehtinen, Ileana | R | FL | U.S. House | 1989 – 2019 |
| | Rose, Charles Grandison, III | D | NC | U.S. House | 1973 – 1997 |
| | Rose, John W. | R | TN | U.S. House | 2019 – 2025 |
| | Rose, Max | D | NY | U.S. House | 2019 – 2021 |
| | Rosen, Jacky | D | NV | U.S. Senate | 2017 – 2025 |
| | Rosendale, Matt | R | MT | U.S. House | 2021 – 2025 |
| | Rosenthal, Benjamin Stanley | D | NY | U.S. House | 1962 – 1983 |
| | Roskam, Peter | R | IL | U.S. House | 2007 – 2019 |
| | Ross, Deborah K. | D | NC | U.S. House | 2021 – 2025 |
| | Ross, Dennis A. | R | FL | U.S. House | 2011 – 2019 |
| | Ross, Mike | D | AR | U.S. House | 2001 – 2013 |
| | Ross, Robert Tripp | R | NY | U.S. House | 1947 – 1953 |
| | Rostenkowski, Daniel David | D | IL | U.S. House | 1959 – 1995 |
| | Roth, Tobias Anton (Toby) | R | WI | U.S. House | 1979 – 1997 |
| | Roth, William V., Jr. | R | DE | U.S. Senate | 1967 – 2001 |
| | Rothfus, Keith | R | PA | U.S. House | 2013 – 2019 |
| | Rothman, Steven R. | D | NJ | U.S. House | 1997 – 2013 |
| | Rouda, Harley | D | CA | U.S. House | 2019 – 2021 |
| | Roudebush, Richard Lowell | R | IN | U.S. House | 1961 – 1971 |
| | Roukema, Margaret S. | R | NJ | U.S. House | 1981 – 2003 |
| | Rounds, Mike | R | SD | U.S. Senate | 2015 – 2027 |
| | Roush, John Edward | D | IN | U.S. House | 1959 – 1977 |
| | Rousselot, John Harbin | R | CA | U.S. House | 1961 – 1983 |
| | Rouzer, David | R | NC | U.S. House | 2015 – 2025 |
| | Rowan, William A. | D | IL | U.S. House | 1945 – 1947 |
| | Rowland, James Roy, Jr. | D | GA | U.S. House | 1983 – 1995 |
| | Rowland, John | R | CT | U.S. House | 1985 – 1991 |
| | Roy, Chip | R | TX | U.S. House | 2019 – 2025 |
| | Roy, William Robert | D | KS | U.S. House | 1971 – 1975 |
| | Roybal, Edward Ross | D | CA | U.S. House | 1963 – 1993 |
| | Roybal-Allard, Lucille | D | CA | U.S. House | 1993 – 2023 |
| | Royce, Ed | R | CA | U.S. House | 1993 – 2019 |
| | Royer, William Howard | R | CA | U.S. House | 1979 – 1981 |
| | Rubio, Marco | R | FL | U.S. Senate | 2011 – 2029 |
| | Rudd, Eldon Dean | R | AZ | U.S. House | 1977 – 1987 |
| | Rudman, Warren Bruce | R | NH | U.S. Senate | 1980 – 1993 |
| | Ruiz, Raul | D | CA | U.S. House | 2013 – 2025 |
| | Rulli, Michael | R | OH | U.S. House | 2024 – 2025 |
| | Rumsfeld, Donald Henry | R | IL | U.S. House | 1963 – 1969 |
| | Runnels, Harold Lowell | D | NM | U.S. House | 1971 – 1981 |
| | Runyan, Jon | R | NJ | U.S. House | 2011 – 2015 |
| | Ruppe, Philip Edward | R | MI | U.S. House | 1967 – 1979 |
| | Ruppersberger, C.A. | D | MD | U.S. House | 2003 – 2025 |
| | Rush, Bobby | D | IL | U.S. House | 1993 – 2023 |
| | Russell, Charles Hinton | R | NV | U.S. House | 1947 – 1949 |
| | Russell, Donald Stuart | D | SC | U.S. Senate | 1965 – 1966 |
| | Russell, Richard Brevard, Jr | D | GA | U.S. Senate | 1943 – 1973 |
| | Russell, Sam Morris | D | TX | U.S. House | 1945 – 1947 |
| | Russell, Steve | R | OK | U.S. House | 2015 – 2019 |
| | Russo, Martin Anthony | D | IL | U.S. House | 1975 – 1993 |
| | Ruth, Earl Baker | R | NC | U.S. House | 1969 – 1975 |
| | Rutherford, J.T. | D | TX | U.S. House | 1955 – 1963 |
| | Rutherford, John | R | FL | U.S. House | 2017 – 2025 |
| | Ryan, Harold Martin | D | MI | U.S. House | 1962 – 1965 |
| | Ryan, Leo Joseph | D | CA | U.S. House | 1973 – 1979 |
| | Ryan, Pat | D | NY | U.S. House | 2022 – 2025 |
| | Ryan, Paul D. | R | WI | U.S. House | 1999 – 2019 |
| | Ryan, Tim | D | OH | U.S. House | 2003 – 2023 |
| | Ryan, William Fitts | D | NY | U.S. House | 1961 – 1973 |
| | Ryter, Joseph Francis | D | CT | U.S. House | 1945 – 1947 |
| | Ryun, Jim | R | KS | U.S. House | 1997 – 2007 |