Lemlem Hailu (Amharic: ለምለም ኃይሉ; born 25 May 2001)[1] is an Ethiopian middle- and long-distance runner.

At age 16, Lemlem Hailu gained first international experience at the 2017 World Youth Championships in Nairobi, where she won the 1500 metres event.

[1] In 2021, Hailu secured an overall 3000m World Indoor Tour victory, winning two top-level meets.

She won the event at the Meeting Hauts-de-France Pas-de-Calais in Liévin, and the Copernicus Cup in Toruń.

Elle Purrier St. Pierre won silver in 8:42.04 while Hailu's compatriot Ejgayehu Taye was third in 8:42.23.