Albums
1. Gold - 1,190,000 (1992)
2. Best Of (1975) - 1,100,000
3. Arrival (1976) - 900,000
4. ABBA (1975) - 700,000
5 18 Hits (2005) - 210,000
6. Ring Ring (1973) - 142,000 *
7. The Definitive Collection (2001) - 140,000
8. Waterloo (1974) - 112,000 *
9. The Album (1977) - 100,000 (guestimate)
10. Complete Gold - 70,000
Best Selling Albums of All Time in Australia - ABBA has four entries. Other sources 2014 2013, 2004 2002 and 2001
* From Billboard Ad, 1977. Check out this list too.
Singles
1. Fernando gold x24 400,000 *
2. Dancing Queen goldx13 322,000 *
3. Money Money Money goldx13 244,000 *
4. I Do I Do I Do - gold x10
5. Mamma Mia - goldx9
6. SOS goldx5
See here for source.
* From Billboard Ad 1977