John McClannahan Crockett (December 26, 1816 – August 4, 1887) was a Texan lawyer, mayor of Dallas, and the eighth Lieutenant Governor of Texas.

Crockett started practicing law in the Dallas area, and also became deputy county clerk there.

He was involved in multiple court trials, and was a law partner of John Jay Good in the first half of the 1850s.

[2] Crockett was elected as the second mayor of Dallas in 1857, serving for three non-consecutive terms; his last was 1865–1866.

He returned to the Dallas area to become superintendent of the Confederate arms factory in Lancaster, Texas.