John Gardner was a Scots-born Presbyterian minister in Adelaide, South Australia, the first incumbent of Chalmers Free Church of Scotland, now Scots Church, North Terrace, Adelaide. He later served at Launceston, Tasmania and Queenscliff, Victoria.

Scots Church is a Uniting church on the southwest corner of North Terrace and Pulteney Street in Adelaide, the capital city of South Australia. Founded by the Free Church of Scotland, the stone church was one of the early churches built in the new city in 1850, built as the Chalmers Church.