William Pugsley PC KC (September 27, 1850 – March 3, 1925) was a politician and lawyer in New Brunswick, Canada.

He was born in Sussex, New Brunswick, the son of William Pugsley, of United Empire Loyalist descent, and Frances Jane Hayward.

He resigned in September of that year to become Minister of Public Works in the federal Liberal government of Sir Wilfrid Laurier.

He served in that position until the government's defeat in the 1911 federal election, but remained as a Member of Parliament (MP) until 1917 when he was appointed the 15th lieutenant governor of New Brunswick.

Pugsley was staying at King Edward Hotel when he fell ill and died of pneumonia in Toronto in 1925.