Shah Rukh Khan as Shekhar Subramaniam / G.One

Arjun Rampal as Ra.One

Kareena Kapoor Khan as Sonia S. Subramanium

Armaan Verma as Prateek

Tom Wu as Akaashi

Shahana Goswami as Jenny Nayar

Dalip Tahil as Barron

Satish Shah as Iyer

Suresh Menon as Taxi Driver

Atul Sharma as Airport Security Guard

Ben Hawkey as Billy

Delnaaz Irani as School Teacher

Charanpreet Singh as Airport Goon

Priyanka Chopra Jonas as Desi Girl

Sanjay Dutt as Khalnayak

Shola Adewusi as Airport Cop

Paul Lowe as Mugger

Georgia Curtis as Backing Dancer

Rajinikanth as Chitti / Self

Amitabh Bachchan as Self - Narrator (voice)

Jon Wennington as Airport Security Guard (uncredited)