Henry Brooke Parnell, 1st Baron Congleton PC (3 July 1776 – 8 June 1842), known as Sir Henry Parnell, Bt, from 1812 to 1841, was an Irish writer and Whig politician. He was a member of the Whig administrations headed by Lord Grey and Lord Melbourne of the 1830s and also published works on financial and penal questions as well as on civil engineering. He was a grand-uncle to the Irish nationalist leader Charles Stewart Parnell.