William Justice (by 1448 – 1521), was an English politician.
He was made Sheriff (1495–96) and Mayor of Southampton (1501–02) where he traded in wine and other commodities from 1481.
After moving to Reading, Berkshire he was elected a Member (MP) of the Parliament of England for Reading in 1510.
His son-in-law was the MP, Richard Lybbe.
This article about a 16th-century member of the parliament of England is a stub.