David Henry Williams (March 19, 1819 – June 1, 1891) was a railroad surveyor, civil engineer and writer in civilian life.

After the expiration of his appointment in 1863, Williams resigned from the Union Army and returned to his career as a civil engineer and, after his health soon declined, a writer for newspapers and magazines.

[1] Historian Ezra J. Warner wrote that Williams's obituary stated that he served in the Mexican-American War but he is not listed as an officer in F. B. Heitman's Historical Register.

[4][5] Historian Stewart Sifakis wrote that Williams served "apparently as an enlisted man.

[4] The regiment did not become engaged in heavy combat in the Maryland Campaign or the Battle of Fredericksburg and suffered few losses in them.