This is a complete list of United States senators during the 74th United States Congress listed by seniority from January 3, 1935, to January 3, 1937.
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 is the population of the senator's state.
Senators who were sworn in during the middle of the Congress (up until the last senator who was not sworn in early after winning the November 1936 election) are listed at the end of the list with no number.
In this Congress, Park Trammel was the most senior junior senator until his death on May 8, 1936, after which it was Gerald Nye. Four senators held the distinction of most junior senior senator during this Congress: Homer Bone from January 3 to May 6, 1935; Carl Hatch from May 6, 1935 to June 17, 1936; Scott Loftin from June 17 to November 4, 1936; and Charles Andrews from November 4, 1936 to the end of this Congress.
The most senior senators by class were Henry F. Ashurst (R-Arizona) from Class 1, William Borah (R-Idaho) from Class 2, and Ellison D. Smith (D-South Carolina) from Class 3.