Sir John Bussy ⓘ (died 1399) was an English knight and royal official who became one of the closest political advisers of Richard II of England ⓘ during the final years of the king’s reign. Together with William Bagot ⓘ and Sir Henry Green ⓘ he formed part of the king’s inner circle of councillors.

Bussy came from a Lincolnshire gentry family whose estates were centred at Hougham. Through royal service he rose to prominence in the later years of Richard II’s government and was repeatedly elected to Parliament. In 1394 he served as Speaker of the House of Commons.

By the later 1390s Bussy had become one of the king’s most trusted political agents. Alongside William Bagot and Sir Henry Green he was widely regarded as one of the three principal councillors upon whom Richard relied in matters of government.

When Richard II departed for Ireland in May 1399 Bussy, Bagot, Green and the treasurer William le Scrope ⓘ were left responsible for administering the kingdom. During the king’s absence, however, Henry IV of England ⓘ, then Henry Bolingbroke, returned from exile and landed in Yorkshire.

The royal councillors withdrew to Bristol Castle in an attempt to resist Bolingbroke’s advance. The fortress soon fell to the rebel army. Bussy was captured and summarily executed at Bristol in July 1399.