I Am Heath Ledger

• Heath Ledger as himself (archive footage)
• Ben Harper as himself, musician and friend of Ledger's
• N'fa as himself, musician and friend of Ledger's
• Ben Mendelsohn as himself, actor and friend of Ledger’s
• Naomi Watts as herself, actress and ex-partner of Ledger’s
• Djimon Hounsou as himself, actor
• Emile Hirsch as himself, actor
• Ang Lee as himself, filmmaker
• Matt Amato as himself, filmmaker
• Catherine Hardwicke as herself, filmmaker
• Edward Lachman as himself, filmmaker
• Christina Cauchi as herself, model and ex-partner of Ledger’s
• Justin Vernon as himself, musician (Bon Iver)
• Mia Doi Todd as herself, musician
• Grace Woodroofe as herself, musician
• Carlos Niño as himself, music producer
• Steve Alexander as himself, agent
• Gerry Grennell as himself, dialect coach
• Ledger's parents Sally and Kim, sisters Kate, Olivia and Ashleigh, and childhood friends

Notably Michelle Williams, ex-partner of Ledger and mother of his daughter Matilda, was not in the film.

Ledger's family agreed to participate only after Williams "gave her blessing" and when Ledger's friend Matt Amato got involved in the project.^[2]