The winning track vaulted to the top of the chart after last Saturday's (May 26) show, pushing Ireland's official Euro 2012 football anthem 'The Rocky Road to Poland' down to two.
fun.'s 'We Are Young' is at three, Marina and the Diamonds slips to four with 'Primadonna' and Maroon 5 remain at five with 'Payphone'.
Jedward's Eurovision entry for Ireland, 'Waterline', moves up to seven, while Flo Rida's latest single 'Whistle' enters at eight.
Coldplay and Rihanna's 'Princess of China' moves up to 15, Kylie Minogue's 'Timebomb' debuts at 26 and Justin Bieber's Believe album track 'Die in Your Arms' is at 28.
Outside the Top 40, fun.'s new single 'Some Nights' begins to climb at 45, Lawson trail at 46 with 'When She Was MIne', and Gary Barlow's Diamond Jubilee single 'Sing' is at 53.
This week's Irish Top 10 is as follows:
1. (-) Loreen: 'Euphoria'
2. (1) Various Artists: 'The Rocky Road to Poland'
3. (2) fun. featuring Janelle Monaé: 'We Are Young'
4. (3) Marina and the Diamonds: 'Primadonna'
5. (7) Maroon 5 featuring Wiz Khalifa: 'Payphone'
6. (4) Nicki Minaj: 'Starships'
7. (10) Jedward: 'Waterline'
8. (-) Flo Rida: 'Whistle'
9. (7) Carly Rae Jepsen: 'Call Me Maybe'
10. (4) The Wanted: 'Chasing the Sun'
Watch Loreen's winning performance of 'Euphoria' at the Eurovision Song Contest 2012 below: