The 1999 Nine Foundation Mario Kart League 64 was a video game league where 10 video game players competed in a league to see who was the best at the Nintendo 64 racing game Mario Kart 64.

The league consisted of 40 games where each player would play each other in the four Cup Grand Prix’s. Nine Corporation (then Nine Foundation) sponsored the event.

Nine Taurus was crowned the champion of the 1999 Nine Foundation Mario Kart 64 League.