John Richard Dellenback (November 6, 1918 – December 7, 2002) was a Republican U.S. congressman from Oregon.

He wrote legislation to establish the Oregon Dunes National Recreation Area, worked to pass a bill that made pipeline permit-holders and shippers liable for oil spills,[2] and supported federal Title IX legislation for equal opportunity for boys and girls in athletics.

[6] Dellenback served four terms in the House and was defeated in the 1974 elections by liberal Democrat Jim Weaver.

Dellenback's defeat is largely attributed to the anti-Republican mood of the electorate in the wake of the Watergate scandal.

After leaving Congress, Dellenback was appointed by President Gerald Ford as director of the Peace Corps, where he served from 1975 to 1977.