William Henry Timlin (May 28, 1852 – August 21, 1916) was an American jurist.
Born in Mequon, Wisconsin, he worked on a farm and studied surveying, stenography and taught school.
He studied law and was admitted to the Wisconsin bar in 1878.
He practiced law in Kewaunee, Wisconsin and later in Milwaukee, Wisconsin.
He served on the Wisconsin Supreme Court from 1907 until his death.