Dear Zachary: A Letter to a Son About His Father is a 2008 American documentary film conceived and created by Kurt Kuenne.

Kuenne's close friend Andrew Bagby was murdered by Shirley Jane Turner after Bagby ended their tumultuous relationship. Shortly after she was arrested, she announced she was pregnant with Bagby's child, a boy she named Zachary. Kuenne decided to interview numerous relatives, friends, and associates of Andrew Bagby and incorporate their loving remembrances into a film that would serve as a cinematic scrapbook for the son who never knew him.

The film premiered at the Slamdance Film Festival and was shown at Cinequest Film Festival, South by Southwest, the Hot Docs Canadian International Documentary Festival, the Sarasota Film Festival, the Sidewalk Moving Picture Festival, the Calgary International Film Festival, and the Edmonton International Film Festival, among others, before going into limited theatrical release in the United States, opening in one city at a time in select metropolitan areas. It was broadcast by MSNBC on December 7, 2008 and has been repeated several times since.

Kuenne is donating all profits from the film to a scholarship established in the names of Andrew and Zachary Bagby.

While not the best made documentary of the year, it tells a story that so compelling and unbelievable and emotionally stunning, that it overcomes any technical issues it may have.