Tiril Udnes Weng (born 29 September 1996) is a Norwegian cross-country skier, who won overall World Cup in 2023 At the 2014, 2015 and 2016 Junior World Championships she won two bronze medals (one in relay), one silver and one gold medal (both in relay).

She broke the top 20 for the first time in January 2018 in Seefeld, finishing 11th, following up with a 9th place in March in Drammen.

In February 2019 in Lahti she reached the sprint final for the first time, finishing 6th.

[1] Weng represents the sports club Nes Ski.

[2] All results are sourced from the International Ski Federation (FIS).