The 2017 World RX of Belgium was the fourth round of the fourth season of the FIA World Rallycross Championship. The event was held at the Circuit Jules Tacheny Mettet in Mettet, Wallonia and also played host to the third round of the 2017 FIA European Rallycross Championship. It also hosted the first round of the 2017 RX2 International Series, the support category of the World Rallycross Championship.

The 2017 FIA World Rallycross Championship presented by Monster Energy was the fourth season of the FIA World Rallycross Championship. The season consists of twelve rounds, started on 1 April with the Spanish round at the Circuit de Barcelona-Catalunya and concluded on 12 November at the Killarney Motor Racing Complex in Cape Town, South Africa.