Tiger Woods' kindergarten teacher isn't the only person to say Tiger is telling a fish tale about a racial attack in school ... the former principal questions Tiger's story as well.

Donald Hill, the former principal of Cerritos Elementary School in Cypress, CA, has said he never heard about the incident where Tiger claimed to have been tied to a tree and the racial epithet spray-painted on his body.

And there's more. Linda DaVeiga -- a parent who was constantly at the school around the time the alleged incident occurred -- tells TMZ she never heard of any such incident.

And it turns out, Maureen Decker, the teacher who will be front and center at Gloria Allred's news conference at 10:30 PT, addressed the alleged incident in 2005, saying the incident never occurred.

The news conference should be interesting.