Adam Herz (born September 10 1972) is an American screenwriter and producer. He founded the production company Terra Firma Films in 2003 with a first-look deal at Universal Studios.

Herz was born in New York City and raised in East Grand Rapids, Michigan. He is the oldest of two boys, and his father, David, is a reputable brain surgeon in Grand Rapids Michigan. Herz graduated from East Grand Rapids High School (See also East Grand Rapids Public Schools. He moved to Los Angeles after graduation from the University of Michigan in 1996. He held a number of production assistant jobs while working on writing spec scripts.

His first screenplay, originally titled East Great Falls High, was written over a winter ski vacation in 1998. It was based on his high school years in East Grand Rapids, Michigan. It sold for a reported $650,000 in 1999 and became the popular American Pie.