The D. J. Lawlor was a 19th-century Boston pilot boat built in 1881 at North Weymouth, Massachusetts. The schooner was considered the largest for her type, noted for her seaworthiness and heavy weather performance. She was named after the prominent Boston shipbuilder Dennison J. Lawlor. She was struck by a fishing schooner Horace B. Parker, in 1895, and was replaced by the pilot-boat Liberty in 1896.

Dennison J. Lawlor, was a 19th-century Canadian-Irish shipbuilder and yacht designer. He apprenticed under shipbuilder Whitmore & Holbrook. Lawlor had his own shipyard, building and designing for 40 years some of the finest yachts, pilot boats, and 150 merchant vessels built from his designs. The most notable were the Hesper, Florence, and D. J. Lawlor. Lawlor died in Chelsea, Massachusetts in 1892.