The PFL 4 mixed martial arts event for the 2019 season of the Professional Fighters League was held on July 11, 2019, at the Ocean Resort Casino in Atlantic City, New Jersey.

This was the fourth regular season event of 2019 and include fights in the welterweight and women's lightweight divisions.

The PFL points system is based on results of the match.

If the fight ends in a draw, both fighters will receive 1 point.

If a fighter misses weight, the opponent (should they comply with weight limits) will receive 3 points due to a walkover victory, regardless of winning or losing the bout; if the non-offending fighter subsequently wins with a stoppage, all bonus points will be awarded.