Kabir Duhan Singh (born 8 September 1986) is an Indian actor, who appears in Telugu, Kannada, Tamil and Malayalam films. He made his debut in the Telugu film Jil (2015). Singh has carved out a career as an antagonist in the film industry. Some of his notable appearances as an antagonist are in Vedalam (2015), Sardaar Gabbar Singh (2016) and 2024 films Turbo and Marco.

Kabir Duhan Singh was born in Gohana and brought up in Faridabad in Haryana. Singh married Seema Chahal in 2023. The wedding took place in Haryana.

Singh moved to Mumbai in 2011 and took up modelling as a career. He took up many a Fashion Week assignments and participated in international work as a part of his occupation. His first foray into acting was a part of a Hindi film project starring Shiney Ahuja, but the film was subsequently shelved. Eager to make a career in films, he became a stage actor and then successfully auditioned to be a part of the Telugu film Jil (2015), whose makers had been looking for an antagonist with a North Indian background. The film subsequently won him positive reviews, while his follow up in Kick 2 (2015) was equally appreciated. In order to maintain the high quality of his acting roles, Kabir chose to carefully analyse his characters before committing to roles and turned down other ventures which would have seen him portray the protagonist as well as a role in Bengal Tiger (2015). The actor then made his debut in Tamil films by portraying a villain in Siva's revenge drama Vedalam (2015), which had Ajith Kumar in the lead role.

Following the success of his initial films, Singh began working on several Telugu films at the same time including Dictator and Sardaar Gabbar Singh, both released in 2016, and was reported to be the "busiest baddie in Southern filmdom".

His antagonist character Cyrus Isaac in the 2024 Malayalam film Marco was well received by the audience.