James John Lonsdale (5 April 1810–11 November 1886) was an English barrister and judge.
In 1833, Lonsdale was appointed secretary to the Royal Commission on the Criminal Law, serving until 1845.
[1] In 1845, Lonsdale was appointed secretary to its successor, the Royal Commission on Revising and Consolidating the Criminal Law, serving until 1849.
[9] Lonsdale was called to the bar at Lincoln's Inn on 22 November 1836.
11 in the West Riding of Yorkshire from 14 February 1855 to 19 March 1867 and judge of circuit No.