William Cummings (1 February 1803 – 22 January 1878) was an Irish-born Australian politician.
He was the son of pastoralist Keenan Cummings and Elizabeth Shelly, and migrated to New South Wales around 1822.
He became a pastoralist and squatter, acquiring extensive land in the Wellington and Lachlan districts.
On 19 October 1829 he married Mary Ducey; they would have eleven children.
In 1859 he was elected to the New South Wales Legislative Assembly for East Macquarie, serving until his defeat in 1874.