Clayton C. Klein, Jr. (born November 13, 1949) is a former member of the Oregon House of Representatives, representing Central Point, Oregon, and portions of Jackson County, Oregon, United States. He served two terms, from January 1977 through 1980, in the and the (in 1979), as well as a 1980 special session. Klein was reelected in November 1978 to a second two-year term. In January 1979, he was elected House majority whip by his fellow legislators. He ran again for the seat in 1980, but was defeated in the November general election by Republican Rebecca DeBoer.