The parents of William Harris are not known.

Details of William's birth are not known.

William married Elizabeth Chapman on Sunday 13 October 1765 in Luton St Mary, Bedfordshire.

He had the following children from his marriage to Elizabeth Chapman:

- Ann Harris	born around 1768 in Luton, Bedfordshire.
- John Harris	born around 1769 in Luton, Bedfordshire.
- William Harris	born around 1772 in Luton, Bedfordshire.
- Sarah Harris	born around 1773 in Luton, Bedfordshire.
- James Harris	born around 1777 in Luton, Bedfordshire.
- Joseph Harris	born around 1781 in Luton, Bedfordshire.

Details of William's occupation are not known.

William died in 1799.  

He was buried on Sunday 14 July 1799 in Luton, Bedfordshire.