RatPac Entertainment, LLC was an American media and entertainment company that financed and produced motion pictures, television, documentaries, live theater, and podcasts. The company was owned by Brett Ratner and James Packer.

Dune Entertainment was a company founded by Steven Mnuchin in 2004.

Mnuchin founded Dune Entertainment as a side business. It financed a number of large-budget films, mostly for 20th Century Fox, including the X-Men film franchise and Avatar. In 2012, after Dune's deal with 20th Century Fox ended, Mnuchin worked with the filmmaker Brett Ratner and the Australian businessman James Packer to merge his Dune Entertainment company with Ratner and Packer's newly founded RatPac Entertainment joint venture which would be formed into RatPac-Dune Entertainment in 2013; the following year.

Between 2013 and 2018, RatPac-Dune financed many films for Warner Bros., including American Sniper and Mad Max: Fury Road. Mnuchin was co-chairman of the trio's movie company, Relativity Media, but left seven months before it went bankrupt.

In September 2013, RatPac partnered with Dune Entertainment on a multi-year motion picture co-financing arrangement with Warner Bros., financing over $1 billion for 75 of the studio's films.

In December 2013, RatPac signed a deal starting as of January 1, 2014 to finance films as part of a production deal between Plan B Entertainment and New Regency.

RatPac Entertainment has co-financed 81 theatrically released motion pictures exceeding $17 billion in worldwide box office receipts. RatPac's co-financed films have been nominated for 59 Academy Awards, 25 Golden Globes and 43 BAFTAs and have won 25 Academy Awards, 8 Golden Globes and 24 BAFTAs.

In late 2017, Access Entertainment bought Packer's controlling stake in the company. Sometime in 2018, the studio shut down and its operations were folded into Access Entertainment.