- Wentworth2
- West Penn Island, Hudson Bay coast, ca. 7 km East of Manitoba border1
- West Williams Twp, banks of Ausauble River at "Hungry Hollow".1
- West end of Arrow Lake, Laverendrye Waterway Provincial Park.2
- West end of Kilmaurs side road, 1/2 km south, Regional Municipality of Ottawa-Carleton.2
- West end of White Lake on road to Big Gang Ranch NW of Clinton.1
- Western Islands (north group), 60' island, Georgian Bay, Parry Sound Dist.1
- Western Islands (north group), 62' island, Georgian Bay, Parry Sound Dist.1
- Western Islands, around Western Isl. harbour, Georgian Bay.1
- Westminster Township, Kain's Road forest along south side of Thames R, 6.8 km NE of Komoka P.O.1
- Westmorland1
- Wheatley P.O, Romney Twp.1
- Wheatley Prov Park, Romney Tp.1
- White Mountain1
- White Mountain, alkaline pond south of.1
- White Pine Reserve at SE corner of Greenwood L on Sagnagons L Access Rd of Great Lakes Forest Products limits.1
- Whytewald, rivage du riusseau Little Tugela.1
- Windsor.2
- Winisk River Twp., Peawanuck; trail from near dump east to Mishimattawa River, Polar Bear Prov. Park1
- Winisk River Twp., Peawanuck; trail from near dump east to Mishimattawa River, Polar Bear Provincial Park2