Petrus Willem van der Walt (born 6 January 1989 in Brits, North West) is a South African-born Japanese rugby union player who represents Japan at international level and is currently playing with NTT DoCoMo Red Hurricanes in the Japanese Top League.

In October 2011, he joined Italian National Championship of Excellence team San Gregorio and made sixteen appearances for them in the 2011–2012 season, but could not help stop them from finishing last in the table and getting relegated to Serie A1 in 2012–13.

He returned to South Africa a few months later and joined Eastern Province Kings for the 2012 Currie Cup First Division season.

[13] He signed for Japanese Top League side NTT Docomo Red Hurricanes for the 2013–14 season,[14] scoring two tries in 13 appearances.

[15] He returned to South Africa following the conclusion of the 2013–14 Top League and joined the Bulls on a two-month contract during the 2014 Super Rugby season.