As of 2009 it is Chris Johnson of the Tennessee Titans with an electronically-timed 40 yard dash of 4.24.In college football it is tie between the Kansas Jayhawks Jake Sharp and the Florida Gators Jeff Demps, both have been timed at 4.29Bo Jackson ran a 40-yard dash in a blistering 4.12 seconds (hand-timed), which is still the fastest verifiable 40-yard dash ever recorded at any NFL Combine.
The fastes would have 2 be Jeff demps the Florida gators running back he runs a 10.01 in the 100 meter 40 yard dash does not mean anything but he still had a fast time of 4.16 he takes it but he did lose to chris rainey with a time of 4.06
he ran a 4.21 in his forty yard dash in Miami
Mike Alstott ran a 4.66 40-yard dash in his college combine in 1996.
4.49 out of college4.49 out of college
In college, he ran a 4.25 40.
4.64 coming out of college