Allan Wyon was an English medallist and seal-engraver.

He was the son of Benjamin Wyon, and the younger brother of Joseph Shepherd Wyon and Alfred Benjamin Wyon. He went into the family arts, and for a time supported his brother Joseph in medal-work. From 1884 till his death he carried on in London the business of the Wyon firm of medallists and engravers founded by his grandfather, Thomas Wyon the elder.

From 1884 to 1901 Wyon held the post of engraver of the royal seals, a post that had been successively held by his father and his two elder brothers. He was a fellow of the Society of Antiquaries of London (elected 1889) and of the Numismatic Society of London (elected 1885), and was at one time treasurer and vice-president of the British Archæological Association. His medal designs included the Jenner Medal of the Royal Society of Medicine.

Wyon died at Hampstead on 25 January 1907.