Is Alert (in Canada) a harbor/port? Alert, in Qikiqtaaluk Region, Nunavut, Canada, is northernmost permanently inhabited place in world.
The site was first visited by Sir George Nares, who commanded HMS Alert in 1875-76, the first vessel to land on the shores of northern Ellesmere Island.
Is Alert a harbor/port? (I've read a few papers about Alert, but I haven't found the answer.)
Wikipedia does not include Alert as a port.  As the comments suggest, there is too much sea ice at that latitude to merit the infrastructure required of a port.  The northernmost port in the world is identified here as Dikson, Russia, at 73°30' N.
Supplies to Alert are delivered by air; the settlement does include an air port.