This is just my personal listing of all flags that have/could have been flown over a Formula One podium. In essence, all F1 drivers' countries, 1900-present, all variations.
Argentina edit
Flag_of_Argentina Prior to 1941, less standardized.
Australia edit
Edited in 1908, adding 7th point to "commonwealth star", unchanged since. (standardized in 1953) FOTW Flag_of_Australia
Austria edit
Claimed to be the oldest flag in existance.