The 2018 Townsville 400 (formally known as 2018 Watpac Townsville 400) was a motor racing event for the Supercars Championship, held on the weekend of 6–8 July 2018.

The event was held at Townsville Street Circuit near Townsville, Queensland and consisted of two races, both 200 kilometres in length.

It was the eighth event of sixteen in the 2018 Supercars Championship and hosted Races 17 and 18 of the season.