St. John McLean Buckley (1869 – 6 August 1915) was a New Zealand sheep farmer.
[1][2] He was sent to England for his education, and studied law at the University of Oxford.
[2] After returning to New Zealand in 1891 he managed several sheep estates for his uncle John McLean.
When McLean died in 1902, he left his estate to Buckley.
[2][3] Buckley subsequently built a large brick homestead at Redcastle, which is now St Kevin's College, Oamaru.