Jonas Earll Jr. (1786 – October 28, 1846, in Syracuse, New York) was an American politician.
The family appears in a census taken in 1790 at Granville in Washington Co. Earll Jr. was Sheriff of Onondaga County from 1815 to 1819.
In May 1831, Earll Jr. was appointed by Governor Enos T. Throop as a Canal Commissioner, to fill the vacancy caused by the resignation of Henry Seymour.
He remained in office until February 1840 when the new Whig majority removed all Democratic commissioners.
He was buried at the Walnut Grove Cemetery in Onondaga Hill, New York.