John Carroll LeGrand (1814 – December 28, 1861) was an American politician and jurist who served as chief judge of the supreme court of the U.S. state of Maryland, the Court of Appeals, and as Speaker of the Maryland House of Delegates.

He attended private school, studied law under James M. Buchanan, and was admitted to the bar around 1837.

[1] LeGrand served as a member of the Maryland House of Delegates from 1839 to 1841, including a period as Speaker in 1841.

[1] From 1844 to 1851, LeGrand served as Associate Judge of the Sixth Judicial Circuit of Maryland.

LeGrand was defeated for re-election by Unionist candidate Silas Morris Cochran, after a letter he wrote to the Baltimore Sun calling for Maryland to secede from the United States was publicized.