The leopard was spotted around 8 AM at C block of Race Course Marg, near the Army hospital, conservator of forests, H K Awasthi said.
Army personnel and forest officials reached the spot and cordoned off the area.
Awasthi said the area has been sealed as a precautionary measure and people have been cautioned not to venture there.
Forest officials have been alerted in Meerut, Noida and adjoining areas and the hunt is on for the leopard.
Earlier also a leopard had entered a hospital in Begumpur area here. The leopard had mauled several people but the forest officials were unable to catch it.