This is a complete list of United States senators during the 92nd United States Congress listed by seniority from January 3, 1971, to January 3, 1973.
Order of service is based on the commencement of the senator's first term. Behind this is former service as a senator (only giving the senator seniority within their new incoming class), service as vice president, a House member, a cabinet secretary, or a governor of a state. The final factor includes the population of senator's state.
In this congress, the most senior junior senator was J. William Fulbright. The most junior senior senator was William Saxbe.
Senators who were sworn in during the middle of the two-year congressional term (up until the last senator who was not sworn in early after winning the November 1972 election) are listed at the end of the list with no number.
The senior senators by class were John C. Stennis (D-Mississippi) from Class 1, Richard Russell Jr. (D-Georgia) from Class 2, and George Aiken (R-Vermont) from Class 3. Russell died on January 21, 1971 with Allen J. Ellender (D-Louisiana) became the most senior senator from his class until his death on July 27, 1972, James Eastland (D-Mississippi) became the senior senator from the same class on the second half of the second session. Stennis was the most senior senator from his class while being the junior senator from his state.