Ralph Robert Beistline (born December 6, 1948) is a senior United States district judge of the United States District Court for the District of Alaska.

Born in Fairbanks, Alaska, Beistline received a Bachelor of Arts degree from the University of Alaska Fairbanks in 1972 and a Juris Doctor from the University of Puget Sound School of Law (now Seattle University School of Law) in 1974.

He was a law clerk to three judges on the Superior Court in Fairbanks from 1974 to 1975, and was thereafter in private practice in Alaska from 1975 to 1992, when he was appointed a judge on the Alaska Superior Court.

Beistline was nominated by President George W. Bush on November 8, 2001, to a seat on the United States District Court for the District of Alaska vacated by H. Russel Holland.

He assumed senior status on December 31, 2015.