Ai là triệu phú (English translation: Who is the millionaire?) - is a Vietnamese game show based on the original British format of Who Wants to Be a Millionaire? The show is hosted by Lại Văn Sâm. The main goal of the game is to win up to 150 million đồng (about US$7,200) by answering 15 multiple-choice questions correctly. There are four lifelines - fifty fifty, phone a friend (gọi điện thoại cho người thân), ask the audience (hỏi ý kiến khán giả) and ask three people from the audience (tư vấn tại chỗ, can be used after fifth question, fourth lifeline introduced in 2008). Ai là triệu phú? is broadcast from January 4, 2005[1] to today. It is shown on the Vietnamese TV station VTV3 on every Tuesday at 8PM (UTC+7).
No one in this version has won the top prize, however a contestant in September 2008 and a pair of contestants in November 2008 had reached the final question and ultimately walked away. The answer of the former one wound up being correct.
This show's graphics are based closely to the Australian version of the show.