#1 Madonna
1 American Life (Austria, Belgium, France, Germany, Norway, Sweden, Switzerland, UK, USA)
2 Confessions (Australia, Austria, Belgium, Denmark, Netherlands, Finland, France, Germany, Italy, Norway, Poland, Portugal, Spain, Sweden, Switzerland, UK, USA, Canada)
3 Celebration (Belgium, Denmark, Germany, Ireland, Italy, Mexico, UK, Canada)
4 Hard Candy (Australia, Austria, Denmark, The Netherlands, Finland, France, Germany, Ireland, Italy, Poland, Portugal, Spain, Sweden, Switzerland, UK, USA, Canada)
5 MDNA (Australia, Belgium, The Netherlands, Finland, Ireland, Italy, Poland, Spain, Sweden, UK, USA, Canada)
6 Like A Virgin (The Netherlands, UK, USA, New Zealand)
7 True Blue (Australia, Canada, Switzerland, The Netherlands, Germany, Italy, New Zealand, Spain, UK, USA)
8 Like A Prayer (USA, Italy, Switzerland, Austria, The Netherlands, Sweden, Norway and many more)
9 I’m Breathless (Australia)
10 Erotica (Australia)
11 Bedtime Stories (Australia)
12 Evita (UK, Switzerland, Austria, Belgium)
13 Something To Remember ( Australia, Austria, Finland)
14 Ray of Light (Switzerland, The Netherlands, Finland, Belgium, Norway, Australia, New Zealand, UK, Canada)
15 Music (Switzerland, Austria, France, The Netherlands, Sweden, Finland, Norway, Italy, Canada, UK, USA)
115+ but probably 20 more I didn't bother to count (especially for Like A Prayer)