Uday Raj Aaley is a language researcher, lexicographer, writer and activist from Nepal.

Uday Raj Aaley was born in western Nepal and is a native Magar language speaker.

[4] He began an education programme together with Gyani Maiya Sen-Kusunda and Kamala Sen-Khatri in January 2019 for teaching 20 children Kusunda with support from Nepal's Language Commission.

[5] In 2019, he and Timotheus Adrianus Bodt raised US$5,000 from a grant from Endangered Language Fund and a crowd-funding campaign on GoFundMe to document audio and video materials in Kusunda and create a list of 250 concepts in Kusunda.

[6] He collaborated with Nepalese-American not-for-profit Archive Nepal and received a grant from the British Library in 2023 to develop courses to teach Kusunda online and to higher secondary students through bilingual Nepali-Kusunda books.