The 1998 Irish Masters was the twenty-fourth edition of the professional invitational snooker tournament, which took place from 24 to 29 March 1998. The tournament was played at Goffs in Kill, County Kildare, and featured twelve professional players.

Ronnie O'Sullivan won the final 9–3 against Ken Doherty, however O'Sullivan failed a post-final drugs test and tested positive for cannabis. He was stripped of the title and disqualified from the tournament with the victory awarded to Doherty.

Main draw

Round 1 Best of 11 framesQuarter-finals Best of 11 framesSemi-finals Best of 11 framesFinal Best of 17 frames
England Ronnie O'Sullivan6
England Ronnie O'Sullivan6Scotland Stephen Hendry3
England Jimmy White2England Ronnie O'Sullivan6
Scotland John Higgins4
Scotland John Higgins6
England Steve Davis6England Steve Davis3
England Nigel Bond5England Ronnie O'Sullivan(Disqualified)
Republic of Ireland Ken Doherty
Republic of Ireland Ken Doherty6
Republic of Ireland Fergal O'Brien6Republic of Ireland Fergal O'Brien1
England Peter Ebdon2Republic of Ireland Ken Doherty6
England John Parrott1
England John Parrott6
England John Parrott6Wales Mark Williams3
Malta Tony Drago2

* Ronnie O'Sullivan was stripped of the title and disqualified from the tournament after winning 9–3. O'Sullivan failed a drugs test after testing positive for cannabis. Ken Doherty was awarded the title.

Notes