Dhilluku Dhuddu (; initialism as DD) is an Indian Tamil-language horror comedy film series. In the film series stars Santhanam. While the first two films were directed by Rambhala, the third film was directed by S. Prem Anand. The film series consists of unrelated horror stories. All of the films in the film series are noted for being commercially successful films featuring Santhanam as a lead actor.
After the success of Dhilluku Dhuddu (2016), Rambhala subsequently worked on Dhilluku Dhuddu 2 (2019), a sequel to his first film, with the same technical team and Santhanam. He revealed that he was keen to explore some ideas written for the original that he was unable to feature owing to time constraints.
In 2023, the third film titled as DD Returns (Dare Demons Returns) previously title Dhilluku Dhuddu 3. The film take over Rambhala's assistant S. Prem Kumar of the project as film director.
In 2025, the fourth and final film announced on 21 January 2025, coinciding with Santhanam's birthday, titled as DD Next Level, changed title to Devil's Double Next Level.
This table lists the actors who appear in two or more of the Dhilluku Dhuddu films. Since the first two film's director Rambhala, Santhanam and S. Prem Anand (third film director) are from the comedy show "Lollu Sabha", many comedians from the show feature in the films including Maaran, Manohar and Swaminathan (third film).<blockquote class="toccolours" style="text-align:justify; width:95%; float:center; padding:5px 6px 6px; display:table;">
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The first film received mixed to positive reviews, the second film was released to mixed reviews from critics but positive response from audience, and the third film received positive reviews. The fourth film received mixed reviews.