Misteryo sa Tuwa (English: Joyful Mystery) is a 1984 Philippine period drama-political thriller film written and directed by Abbo Q. Dela Cruz. Set in the town of Lucban, Quezon in 1950, three men Ponsoy (Tony Santos Sr.), Mesiong (Johnny Delgado), and Jamin (Ronnie Lazaro) discovered and retrieved a suitcase from a plane crash site and never reported it to the authorities and when the authorities approach Alcalde Valle, the town's mayor, to help find the suitcase, the latter made a sinister plan to steal the money for his greed. It also stars Amable Quiambao, Alicia Alonzo, Maria Montes, Vangie Labalan, Lito Anzures, and the extras in the film that tackles greed, corruption, and hatred.

Produced and released by the Experimental Cinema of the Philippines, it was first screened overseas via the 7th PIA Film Festival in Japan, the 9th Toronto International Film Festival in Canada, and the 20th Chicago International Film Festival in the United States. It was later released domestically on December 25, 1984, as one of the official entries for 10th Metro Manila Film Festival.

In 2019, the film was digitally restored and remastered by ABS-CBN Film Restoration, with the help of L’Immagine Ritrovata, Kantana Post-Production, and Wildsound Studios.