It's believed to be "Migaloo," an elusive, yet quite famous, albino whale.
People on a whale-watching tour said seeing the creature was amazing. One person said it looked like an iceberg coming out of the waves.
If this is "Migaloo," Wedneday's sighting would be the third of the year.
He was first spotting 21-years ago and until last year, was the only documented all-white whale in the world.