Hamilton was slow to get going at lights out and Bottas seized the opportunity to take a lead he never relinquished.
The reigning champion was pushed hard by Red Bull’s Max Verstappen during the final laps but just about had enough to hang on to second place on the podium.
It was a disappointing start to the season for the Ferrari drivers, with Sebastian Vettel finishing fourth and his new team-mate Charles Leclerc fifth.
More to follow.
Valtteri Bottas overtook Mercedes team-mate and pole-sitter Lewis Hamilton on the first corner and went on to dominate the season-opening Australian Grand Prix in Melbourne
Defending world champion Hamilton was slow off the start line and allowed Bottas to get past him to take the lead
Hamilton spent the remainder of the 58-lap race trailing team-mate Bottas with the Ferrari and Red Bull cars chasing them
It was the perfect start to the new season for Bottas, the Finn demonstrating that he won’t play second fiddle to Hamilton
Max Verstappen claimed third place on the podium behind the two Mercedes with an encouraging drive for the season ahead
The Ferrari of Sebastian Vettel in the pit lane in Melbourne during what was a disappointing start to the season for the German