John Clerk, Lord Eldin FRSE FSA (1757– 30 May 1832) was a Scottish judge based in Edinburgh.

After serving his articles he practised for a year or two as an accountant, and eventually was admitted a member of the Faculty of Advocates on 3 December 1785.

A keen Whig, on 11 March 1806 he was appointed Solicitor General for Scotland in the Grenville administration, an office which he held during the year that the ministry lasted.

Assuming the title of Lord Eldin, he took his seat on the bench 22 November; but his health was poor.

He was buried with his ancestors in the Eldin vault in the Old Kirk of Lasswade, just south of Edinburgh.

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