- O'Neill, Tip5
- Oakar, Mary Rose2
- Oberstar, James L. (James Louis), 1934-20142
- Obey, David R.1
- Odeh, Alex M. (Alex Michael)1
- Organization of Petroleum Exporting Countries1
- Packard, Ron1
- Palestine Information Office (Washington, D.C.)1
- Peabody Coal Company1
- Perkins, Carl C. (Carl Christopher), 1954-3
- Perkins, Carl Dewey, 1912-198411
- Price, Melvin, 1905-19881
- Project Head Start2
- Rahall, Nick J., 1949-9
- Randolph, Jennings, 1902-199811
- Reagan, Nancy, 1921-20161
- Reagan, Ronald48
- Republican Party (U.S. 1854-)1
- Retton, Mary Lou, 1968-1
- Roberts, Pat, 1936-1
