2018 Sydney SuperNight 300

The 2018 Sydney SuperNight 300 (formally known as 2018 Red Rooster Sydney SuperNight 300) was a motor racing event for the Supercars Championship, held on the weekend of 3–4 August 2018. The event was held at Sydney Motorsport Park in Eastern Creek, New South Wales and consisted of one race, 300 kilometres in length. It was the tenth event of sixteen in the 2018 Supercars Championship and hosted Race 21 of the season.

Race

 * Notes
 * – Tim Blanchard received a 5-second time penalty for colliding with Garth Tander.
 * – Cam Waters received a 15-second time penalty for colliding with Tim Slade.

Championship standings after Race 21

 * Drivers' Championship standings


 * Teams Championship


 * Note: Only the top five positions are included for both sets of standings.