Queenslander Dami Im's feel-good win on Seven Network's The X Factor attracted more viewers than Nine Network's The Voice finale earlier this year.
The X Factor Winner Announced was the number one show on Monday with 2.431 million viewers tuning in to see Im take the crown, according to OzTAM's ratings.
Taylor Henderson was second and 14-year-old Jai Waetford was third.
The X Factor Grand Final, which included performances by Katy Perry, Fall Out Boy and Guy Sebastian, drew an audience of 2.251 million to finish second for the evening.
The Voice, which ended in June, also filled the number one and two spots on grand final night, with slightly fewer viewers.
The networks break down their finale shows into segments for ratings purposes.
The Voice Winner Announcement on June 17 was watched by 2.307 million viewers after 2.035 million tuned in to see the Grand Final.
It means Seven can now claim to have the number one singing talent show and the number one cooking reality show on TV.
Nine's reality series Big Brother refuses to be eliminated from the top 10.On Monday, Big Brother, which ends next week, was 10th with 856,000 viewers.