Abraham Liddon Pennock (August 7, 1786 – May 12, 1868)[1] was an American abolitionist, inventor, and businessman who was a prominent voice in the free produce movement and served as vice president of the Pennsylvania Anti-Slavery Society.

A Pennsylvania state historical marker was dedicated in Pennock's honor in Upper Darby Township on October 24, 1985.

He was active in the Underground Railroad and was a founding member of the Free Produce Association, a network of businesses that sold cotton and other products untainted by enslaved labor beginning in 1827.

[7] Friends and frequent visitors to his home included George Thompson, James Russell Lowell, Theodore Dwight Weld, and John Greenleaf Whittier.

The couple had nine named children: George, Mary C. John S., Joseph L., Sarah, Ann, Casper, Abraham L., and Isabella.