Luis Miguel "Chapulín" Díaz Castell (born 1 December 1977, in Mexico City) is a Mexican racing driver who competes in the American Le Mans Series for Level 5 Motorsports.

[1] Diaz earned the Formula Mexico title in 1998, followed by a season in the Panamerican Indy Lights, where he was also Rookie of the Year and the first Mexican driver to win a race in that series.

Diaz was hired by Dorricot Racing in 2002 and competed in his first Formula Atlantic season, finishing fourth in the championship with wins at Portland and Road America.

Díaz made two Champ Car starts, both as a substitute driver at the Autodromo Hermanos Rodriguez circuit in Mexico City.

He kicked off the season with a class win in the 2011 12 Hours of Sebring with Scott Tucker and Ryan Hunter-Reay before earning additional victories at Road America and Laguna Seca.

Diaz made his Le Mans debut in 2012, co-driving with Scott Tucker and Christophe Bouchut in Level 5 Motorsports’ LMP2-class HPD ARX-03b.