W. Dorr Legg (born William Dorr Lambert Legg) (December 15, 1904—July 26, 1994), was a landscape architect and one of the founders of the United States gay rights movement, then called the homophile movement.
The second child of Franc C. Dorr and Frank E. Legg, his older brother was Victor Eldred Legg and younger brother was Frank Evariste Legg, Jr.
He trained as a landscape architect at the University of Michigan at Ann Arbor and from 1935 was professor of landscape architecture at Oregon State Agricultural College (now Oregon State University). He moved back to Michigan in the 1940s to care for his father and the family business.
In 1949 he moved to Los Angeles with his partner Merton Bird. In 1950 the couple founded Knights of the Clock, a support group for interracial gay couples. The couple actively joined the national Mattachine Society, but quickly joined those Mattachine members who separated from the Mattachine Society to publish the first homophile magazine ONE, Inc.. As publisher of the ONE's monthly magazine, Legg sued the United States Postal Service to defend the right of its publications to be distributed through the US Mail. The case, One, Inc. v. Olesen (355 U.S. 371; 78 S. Ct. 364; 2 L. Ed. 2d 352; 1958) was pursued through appeals to a successful conclusion in 1958 before the United States Supreme Court. Legg traveled to Germany in the 1950s to recover the remains of the archives of the Institut für Sexualwissenschaft.
He wrote and edited Homophile Studies in Theory and Practice, published in 1994, co-published by One Institute Press, Los Angeles and GLB Publishers, San Francisco. Legg had previously published Homosexuals Today: A Handbook of Organizations & Publications as Marvin Cutler (pseud. of Dorr Legg) editor, Publications Division of ONE, Incorporated, Los Angeles, 1956.