I am rewiring our masterbath on one 20 Amp circuit. There will be noting besides this bathroom on this circuit.
I would like to install a combo bath fan/recessed can (Broan 744) over the shower. The light says that it us UL listed for use over showers if it is a GFCI protected circuit. Can I connect these lights to the load side of one of the GFCI outlets?
In the US you can. You mentioned 'one of the GFCI outlets'. If you have a single circuit in that bath, you can protect all the receptacles and the shower fan using just one GFCI receptacle, wired properly of course.
Just because you can, doesn't always mean you should