Johnston Knox Corbett (June 20, 1861 – April 22, 1934) was elected to two one year terms as mayor of Tucson, Arizona.

His paternal grandfather was a native of Scotland, but his maternal ancestors had been in America for several generations, and some of them fought for independence in the Revolution.

Corbett started in the lumber business as a boy when employed in his home town for four years.

[1] In the meantime he had become interested in the cattle business, established a ranch in the Rincon Mountains, and at the expiration of his term in the post office located on his property, still retaining his home in Tucson.

In 1898 he disposed of all his cattle interests and made his permanent home in Tucson, and in 1890 was appointed postmaster there.