The ACT Brumbies have launched an ambitious campaign to lure 15,000 fans to Canberra Stadium next week in a bid to reverse an unsustainable drop in game-day crowds.

The Brumbies unveiled details of their "15 for 15" plan on Wednesday, with the club to donate $15,000 to charities if 15,000 fans turn up for the clash against the Japan Sunwolves on June 3.

The Brumbies want fans back at Canberra Stadium. Credit:Rohan Thomson

Brumbies chief executive Michael Thomson said the organisation was still targeting a break-even financial position this year, despite their bottom line taking a hit after average crowds dipped to their lowest mark since 1998.

The second-lowest crowd in Brumbies history watched the team's heartbreaking loss to the Melbourne Rebels two weeks ago, with just 5283 sitting in the stands on a cold and wet night.