His Highness Abdullah is a 1990 Indian Malayalam-language musical drama film written by A. K. Lohithadas and directed by Sibi Malayil. It stars Mohanlal, Nedumudi Venu, Gautami, Sreenivasan, Thikkurissy Sukumaran Nair and Mamukkoya. The film was produced by Mohanlal and was the debut production of his company Pranavam Arts. The film features original songs composed by Raveendran and a background score by Mohan Sithara. His Highness Abdullah was the same team's first film in a trilogy of Indian classical arts films, followed by Bharatham (1991) and Kamaladalam (1992).

The story follows Abdullah (Mohanlal), a low-life Muslim Qawwali singer in Bombay, who is hired by the members of a wealthy royal Hindu family to assassinate their family head, Maharaja Udayavarma (Venu). Abdullah infiltrates the palace under the disguise of a Brahmin classical singer, Ananthan Namboothiri, and tries to assassinate the Maharaja by gaining his confidence.

His Highness Abdullah was released on 30 March 1990. It performed well at the box office, becoming the highest-grossing Malayalam film of the year. The film's soundtrack was also well received. The film won two National Film Awards—Best Supporting Actor for Venu and Best Male Playback Singer for M. G. Sreekumar for the song "Naadaroopini". Raveendran won the Filmfare Award for Best Music Director – Malayalam.

This movie was loosely remade (or freemade) as Aadhavan by K S Ravikumar in 2009