David Baird Sr. (April 7, 1839 – February 25, 1927) was an Irish-born American politician who served as a United States Senator from New Jersey.

A Scots-Irishman born in County Londonderry, Ireland, Baird immigrated to the United States in 1856 and entered the lumber business in Port Deposit, Maryland.

He moved in 1860 to Camden, New Jersey, where he continued in the lumber business and also engaged in banking.

He was subsequently elected as a Republican on November 5, 1918, and until March 3, 1919, when he did not run for reelection.

He resumed his former business pursuits in Camden, where he died and was interred in Harleigh Cemetery.