Antonio Dawson, portrayed by Jon Seda, is a fictional character in the Chicago franchise and is a main character in Chicago P.D. and Chicago Justice. He was introduced as a recurring character on Chicago Fire before the spin-off Chicago P.D. was created. He is the former second-in-command of the Intelligence Unit of the Chicago Police Department (CPD) and regularly appears on Chicago Fire. He is also the older brother of Gabriela "Gabby" Dawson, formerly a paramedic-turned-firefighter at Firehouse 51.

Jon Seda is an American actor. Seda was an amateur boxer who auditioned for and was given a role in the 1992 boxing film Gladiator. He played the role of Chris Pérez alongside Jennifer Lopez in the movie Selena, and portrayed U.S. Marine John Basilone, recipient of the Medal of Honor, in Tom Hanks and Steven Spielberg's The Pacific. On television, he had roles as Detective Antonio Dawson in NBC's Chicago P.D., and as Paul Falsone in NBC's Homicide: Life on the Street.