The 1998 Marlboro Masters of Formula 3 was the eighth Masters of Formula 3 race held at Circuit Park Zandvoort on 9 August 1998.

It was won by David Saelens, for ASM Fina.

With an entry of 47 cars, race organisers changed the format of qualifying to allow every driver a shot at qualifying for the Marlboro Masters itself.

Each qualification race would see the top fourteen cars progressing through to the Marlboro Masters itself, with the pole position being awarded to the winner of the qualification race that was won in the quickest time.

The remaining four cars would be made up from the highest qualifying drivers left.