John P. Jaeckel (April 22, 1865 – June 16, 1941) was an American politician.

[1] Jaeckel was born on April 22, 1865, to German parents in Syracuse, New York.

He worked as a money order clerk at the Auburn post office, and later as a clerk and bookkeeper for a coal dealer.

[1][2] On October 29, 1901, he was the foreman of the witnesses to the execution of Leon Czolgosz at Auburn State Prison.

[4][5] He was president of the New York State Prison Commission, and a member of the New York State Board of Parole which in 1904 denied number racketeer Albert J. Adams's application for parole.