David Gregg (1846-1919) was an American minister at Park Street Church and author.

From 1890 to 1903, Gregg was pastor of the Lafayette Avenue Presbyterian Church in Brooklyn, New York.

[1] Gregg's family traces its ancestry directly back to the Scotch Covenanters of 1638.

Gregg considered himself an abolitionist and delivered his first public speech in support of the Emancipation Proclamation.

During Lee's invasion into Pennsylvania, Gregg enlisted as an "emergency man" in Camp Howe to replace Union troops heading to Gettysburg.