Bryan Malcolm Gaensler (born 1973) is an Australian astronomer and former Young Australian of the Year, currently based at the University of Toronto.
He studies magnetars, supernova remnants and magnetic fields.
On 10 June 2014, it was announced that Gaensler was appointed as Director of the Dunlap Institute for Astronomy & Astrophysics at the University of Toronto, filling the hiatus after James R.
Graham's departure.
Gaensler is currently the co-chair of the Canadian 2020 Long Range Plan Committee with Pauline Barmby.