Date of Birth: 
About William Nyallau Badak
- William Nyallau Badak (born 22 July 1951) is a Malaysian politician.
- He is the Member of the Parliament of Malaysia for the Lubok Antu constituency in Sarawak, representing the Parti Rakyat Sarawak (PRS) in the governing Barisan Nasional coalition.
- He was elected to Parliament in the 2008 election, replacing long-serving incumbent Jawah Gerang as PRS's nominee for the Lubok Antu seat.
- Before entering Parliament, he was a Native Court judge.
- Presently he is a member of Parti Sarawak Bersatu (PSB), after he was sacked from PRS of Barisan Nasional on 22 April 2018 and dropped as candidate in the 2018 election.
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