John Sydney Davis (1817 – 30 September 1893) was an early pastoralist and MLC in colonial Western Australia.

Born in Galway, Ireland in 1817, nothing is known of his life until he arrived in Western Australia on board the Trusty in about 1842.

Initially he lived at Australind, then moved to Hotham River to manage William Burges' station there.

In 1850, Davis joined a group of pastoralists including Major Logue, William and Lockier Burges, and Thomas and Kenneth Brown, in overlanding stock from York to Greenough.

On 12 March 1884, John Davis was elected to the Western Australian Legislative Council seat of Geraldton in a by-election.