Willie Anak Mongin (born 2 June 1975) is a Malaysian politician, entrepreneur, and software engineer who is serving as the Member of Parliament (MP) for Puncak Borneo since May 2018. A member of Parti Pesaka Bumiputera Bersatu, he served as the Deputy Minister of Plantation Industries and Commodities II from August 2021 until November 2022 and from March 2020 to August 2021.

In the 2011 election, Willie under his party of People's Justice Party (PKR) faced Jerip Susil of Barisan Nasional and lost in a large majority.

In the 2013 election, Willie faced James Dawos Mamit at Mambong (now as Puncak Borneo) of PBB but losing again the parliamentary seat.

In the 2016 election, Willie faced Jerip Susil in winning for the Mambong state seat and lost in a large majority.

In the 2018 election, his party of PKR field him to contest the Puncak Borneo parliamentary seat again, defeating the incumbent candidate Genot Sinel.

In 2018, during a debate about introducing a Sales and Services Tax (SST), Bung Moktar Radin was recounting the price of goods at markets when Willie Mongin uttered in reference to a photo purportedly showing a person resembling Bung Moktar sitting in a casino:

Bukan kasino ke, Yang Kinabatangan?

Are you sure that was not a casino, representative of Kinabatangan?