William Duplissea (April 30, 1950 – July 1, 2020) was a Republican Assembly member from California's 20th State Assembly district, who served from 1986 until he was defeated for reelection in 1988 by Democrat Ted Lempert.
He served as the Administrative Director of the Division of Workers' Compensation, Director of the Office of Manufacturing Retention, Public Member of the OSHA Appeals Board serving the administrations of George Deukmejian and Pete Wilson.
He served on 4 committees during his time in the Assembly which were Labor & Employment, Revenue & Taxation, Ways & Means, and Jobs, Economic Development, and the Economy.
Duplissea was born in San Francisco, California.
Duplissea died in Redwood City, California.