Nicholas Fitzwilliam was a Yorkshire gentleman associated with Adwick le Street and was returned to Parliament for a Yorkshire constituency. He is recorded in local historical material as having obtained an ecclesiastical licence for an oratory at his Adwick residence in 1459.

The manor connection is direct enough for inclusion, but the full extent of his title is not established by the sources consulted.

Research sources:
- Historical discussion of Nicholas Fitzwilliam of Adwick in the University of York thesis Government and Political Society in the West Riding, together with the local account of the 1459 oratory licence. — https://etheses.whiterose.ac.uk/id/eprint/2454/1/DX223236.pdf