| Birth Name: | William Knight Boardman |
| Birth Date: | 3 February 1915 |
| Birth Place: | Nevada, Iowa, U.S. |
| Death Place: | Palm Springs, California, U.S. |
| Alma Mater: | Drake University |
| Office: | Speaker of the Alaska House of Representatives |
| Term Start: | 1967 |
| Term End: | 1969 |
| Predecessor: | Mike Gravel |
| Successor: | Jalmar M. Kerttula |
| State House2: | Alaska |
| Term Start2: | January 23, 1961 |
| Term End2: | January 10, 1971 |
| Predecessor2: | (at large) |
| Successor2: | Richard Whittaker |
| District2: | 1st |
| Prior Term2: | 2nd district 1961–1963 |
| Occupation: | Insurance underwriter, politician |
| Spouse: | Florence Pratt, Genie Chance (1971-1993) |
| Children: | 1 |
William Knight Boardman (February 3, 1915 – March 18, 1993) was a Republican Alaska legislator who served as Speaker of the Alaska House of Representatives from 1967 to 1968.
Born in Iowa, Boardman was a resident of Ketchikan, Alaska. An insurance businessman, he served as a member of the Territorial House of Representatives from the 1st District from 1953 to 1954, and as an Alaskan alternate delegate to the 1956 Republican National Convention.
In 1960, Boardman was elected to the Alaska House of Representatives and served in that office through the remainder of the decade. He was the senior member of the House at the time of his reelection defeat in 1970. From 1967 to 1968, he was the 4th Speaker of the Alaska House of Representatives. His predecessor, Democrat Mike Gravel, was a U.S. Senator from 1969 to 1981.
Boardman was a Methodist. Married three times, he had one daughter. He died in Palm Springs, California on March 18, 1993, and was buried in Evergreen Cemetery in Juneau, Alaska.