All The Best: Fun Begins is a 2009 Indian Hindi-language comedy film directed by Rohit Shetty and produced by Ajay Devgn. It stars Ajay Devgn, Sanjay Dutt, Fardeen Khan, Bipasha Basu, Johny Lever, Sanjay Mishra and Mugdha Godse. Upon release, it was a critical and commercial success.

The plot is based on Marathi comedy play Pati Sagle Uchapati which itself is based on the English comedy play Right Bed Wrong Husband. The English play has been an inspiration for Tamil films- Veettuku Veedu and Vishwanathan Ramamoorthy as well as Kannada films- Galate Samsara and Housefull.The film was subsequently remade with slight changes in the story in Malayalam in 2010 as Best of Luck which went on to be remade in Kannada in 2015 as Ond Chance Kodi.