Mailag (formerly Spanish: Sevilla) is an urban barangay in Valencia, Bukidnon, Philippines.

[1] Mailag is situated in the north central portion of Valencia on the western bank of the Sawaga River.

The barangay center is located near the Sawaga traversed by an old section of the Sayre Highway (now named the Bangcud-Mailag bypass road).

A diversion road which bypasses the city centre (Poblacion) of Valencia starts in Mailag and terminates at Musuan.

It encompasses the villages of Bugcaon, Calasungay, Covadonga (now Alanib), Linabo, Monserrat, Oroquieta (now Malaybalay), Silae, and Valencia.