Tadashi Morishita (森下 直, Morishita Tadashi, born in 1964) is a Japanese screenwriter born in Osaka City, Osaka Prefecture. He graduated from Scenario Center Osaka School. He mainly writes screenplays for films and TV dramas, and occasionally for animes.

In 1995, he won the 21st Kido Prize Scenario Contest for his script Abduction. In 1997, this script was made into a movie by Toho, and he won the 21st Japan Academy Award for Best Screenplay.