Paul Gerhart Hatfield (April 29, 1928 – July 3, 2000) was an American attorney, politician, and jurist.

Hatfield was admitted to the Montana bar that same year, commencing his practice in Great Falls.

On January 22, 1978, Montana Governor Thomas Lee Judge appointed Hatfield to the United States Senate to fill the vacancy caused by the death of Lee Metcalf for the term ending January 3, 1979.

Max Baucus praised his former primary opponent for being "one of the most decent and thoughtful people I've had the privilege of knowing.

Hatfield was confirmed by the United States Senate on May 9, 1979, and received his commission the following day.