Willem Petrus Nel (born 30 April 1986) is a South African-born Scottish former professional rugby union player.

[2] He made his international bow against Italy during the 2015 summer Tests, and was subsequently named in the final 31-man squad for the 2015 Rugby World Cup.

[5] Nel played in four (starting three) of Scotland's group matches at the 2019 Rugby World Cup.

In 2023 Nel was selected in the 33 player squad for the 2023 Rugby World Cup in France, making his final appearance for Scotland in the pool stage loss against Ireland.

[6] In March 2024, Nel announced his intention to retire from rugby at the end of the season.