Michael "Mikey" Killen Jr. (born October 1, 2006) is an American professional stock car racing driver who last competed part-time in the ARCA Menards Series West, driving the No.

In 2024, Killen made his debut in the ARCA Menards Series West at the double-header weekend at Irwindale Speedway, driving the No.

9 Ford for Jan's Towing Racing.

[1][2][3] In the Thursday race, he set the slowest time in the lone practice session, qualified in sixteenth, and finished the race six laps down in thirteenth place.

[4][5][6] In the Saturday race, Killen set the thirteenth quickest time in practice, qualified in fifteenth, and finished two laps down in twelfth place.