Walter Alfred Don Munday (1890 – 1950) was a Canadian explorer, naturalist and mountaineer famous for his explorations of the Coast Mountains with his wife Phyllis, and especially for the exploration of the Waddington Range. 
Don met Phyllis in 1918. While on a mountaineering trip an incident occurred which, in Don's words, "lends itself readily to being given a romantic aspect." Don lost his footing on a glacial moraine, and was in danger of slipping into a crevasse. Phyllis jumped to help him restore his balance, and in so doing lost hers. Don managed to grab and steady her until she could regain her feet.
They married in February 1920, spending their honeymoon in a cabin on Dam Mountain near Vancouver. Their daughter, Edith was born in 1921, and at 11 weeks she was carried to the top of Crown Mountain.
From 1923 to 1926 the Mundays lived in a tent, and then a cabin on Grouse Mountain where Don worked cutting a trail from Lonsdale Avenue in North Vancouver to the summit, while Phyllis ran the Alpine Lodge, serving hot drinks and meals to hikers.
Discovery of the Waddington Range
In 1925, while on a trip to Mount Arrowsmith, Vancouver Island, Don and Phyllis Munday spotted what they believed to be a peak taller than Mount Robson, the then accepted tallest peak entirely within British Columbia. In the words of Don Munday "The compass showed the alluring peak stood along a line passing a little east of Bute Inlet and perhaps 150 miles away, where blank spaces on the map left ample room for many nameless mountains." While there is some debate as to whether the peak they saw was indeed Mount Waddington (in fact Don Munday himself observed that the feat is impossible), they almost certainly saw a peak in the Waddington Range, and this led the Mundays to explore the area, and discover the mountain in fact.
Over the next decade, the Mundays mounted several expeditions into the area in an attempt to climb the mountain. Known to them as "The Mystery Mountain", in 1927 the height was measured at 13,260 feet (by triangulation), and the Canadian Geographic Board gave it the name Mount Waddington after Alfred Waddington who was a proponent of a railway through the Homathko River valley. They reached the lower northwest summit in 1928, deeming the main summit too risky.
- 1922 Parapet Peak
- 1922 Isosceles Peak
- 1923 Blackcomb Peak
- 1923 Overlord Mountain
- 1924 Foley Peak
- 1930 Mount Munday
- 1931 Sockeye Peak
- 1936 Silverthrone Mountain
- 1942 Mount Queen Bess
- 1946 Reliance Mountain
Munday died of pneumonia in 1950. 
- O'Connor, Joe (2 July 2018). "The search for B.C.'s Mystery Mountain: Experts said it didn't exist — then Don and Phyllis Munday found it". National Post. Retrieved 2 July 2018.
- Munday p 1
- Munday p4
- Fairley p 59
- Munday p.124
- Munday, Don (1993). The Unknown Mountain. Coyote Books. ISBN 0-9692457-4-2.
- Fairley, Bruce (1994). The Canadian Mountaineering Anthology. Lone Pine. ISBN 1-55105-041-2.
- Lisa Smedman (2006). "Mountaineer blazed trail for B.C. women climbers". The Vancouver Courier. Archived from the original on 2006-10-27.