How to Make Millions Before Grandma Dies, known in Thai as Lahn Mah, is a 2024 Thai comedy-drama film directed by Pat Boonnitipat and co-written by Pat and Thodsapon Thiptinnakorn. It stars Putthipong "Billkin" Assaratanakul and Usha "Taew" Seamkhum in their debut feature film roles. In the film, M (Putthipong), a university dropout low on money, volunteers to take care of his terminally ill grandmother Mengju (Usha), in the hope of pocketing an inheritance.

Development on the film began in 2020 after Thodsapon completed the first draft of the screenplay, which underwent several revisions after Pat was hired as director. Putthipong and Usha were hired soon after the screenplay was complete. Principal photography took place in Bangkok, with filming locations including Talat Phlu. Upon release, How to Make Millions Before Grandma Dies went viral, spurred by a social media trend where viewers posted videos of themselves crying after watching the film.

How to Make Millions Before Grandma Dies was released in Thailand on April 4, 2024, by GDH. It has grossed over $50 million worldwide, becoming the highest-grossing Thai film of 2024, the eleventh-highest grossing domestic film of all time, and broke box office records in several countries across Asia. It received praise from critics for its direction, screenplay, acting performances, music, and heavy emotional weight.