Dean of the United States Senate

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Please help improve this article by introducing more precise citations. (September 2016) (Learn how and when to remove this message)

Dean of the United States Senate
Incumbent Chuck Grassley since January 3, 2023
Member of	United States Senate
Formation	March 4, 1789
First holder	James Gunn

The dean of the United States Senate is an informal term for the senator with the longest continuous service, regardless of party affiliation. This is not an official position within the Senate, although customarily (since 1945) the longest-serving member of the majority party serves as president pro tempore.

The current dean is Republican Senator Chuck Grassley of Iowa. He has been in the Senate since 1981 and became dean in 2023 with the retirement of Patrick Leahy.