David Lowrey Seymour (December 2, 1803, Wethersfield, Connecticut – October 11, 1867, Lanesborough, Massachusetts) was an American lawyer and politician from New York.

Then he studied law, was admitted to the bar in 1829, and commenced practice in Troy, New York.

Seymour was elected as a Democrat to the 28th United States Congress, holding office from March 4, 1843, to March 3, 1845, and was Chairman of the Committee on Revolutionary Pensions.

He died on October 11, 1868, and was buried at Mount Ida Cemetery in Troy.

His law partner and son-in-law Charles E. Patterson was Speaker of the New York State Assembly in 1882.