The "Dhoom:3" star says it's an "incredible privilege to join this league of ladies" and feels honoured.
"It's been a brand that I have always admired for its glamour and powerful message of 'Because you're worth it'. The stunning women that represent the brand across the globe are strong motivators," Katrina said in a statement.
Global ambassador for L'Oral Paris Aishwarya Rai Bachchan, who has been a part of the brand for 12 years, said: "I would like to extend a warm welcome to Katrina to the L'Oral Paris family. I am sure she will enjoy representing team India as brand ambassador and I wish her the very best."