William Busby (15 January 1813 – 23 June 1887) was an English-born Australian politician.

He was the son of civil engineer John Busby and his wife Sarah, and migrated to New South Wales in 1824.

He purchased land near Cassilis in partnership with his brother Alexander in 1837.

On 20 December 1856 he married Catherine Ann Woore, with whom he had twelve children.

[1] He died at Double Bay at his property Redleaf in 1887, leaving an estate worth over £106,000.