Nils Egil Aaness (born 31 January 1936) is a former speed skater from Norway.
Aaness competed on the Norwegian national team from 1959 to 1965, and thus became part of the Norwegian speedskating revolution under the trainer Stein Johnson. His best season was 1962/1963, when he won silver at the Norwegian Allround Championships, skated a world record on the big combination one week later (in late January), became European Allround Champion in Gothenburg early February, and won bronze at the World Allround Speed Skating Championships of Karuizawa three weeks after that.
Nils Aaness had his best years alongside Knut Johannesen, and usually ended up a good number two after him. Aaness won a total of three silver medals and one bronze medal at the Norwegian Championships – every time behind Johannesen.