Jayamangali Blackbuck Reserve, Protected grassland reserve in Tumakuru district, India

Jayamangali Blackbuck Reserve is a protected area in the Tumakuru district of Karnataka, made up of open grassland with scattered Eucalyptus and Acacia trees and patches of low shrubs. The reserve is home to one of the few remaining populations of blackbuck, an antelope species that has become rare across much of India.

The Tumakuru forest division began protecting the grassland in 1987 after blackbuck were reported there, and in 1992 the land passed from the Revenue Department to the Forest Department, which fenced part of it and built a concrete watchtower. A 1997 status survey by the Tumakuru-based Wildlife Aware Nature Club led Karnataka to notify 798.33 acres as a conservation reserve in February 2007, the district's first protected area.

The reserve was earlier called the Maidenahalli Conservation Area, after the village of Maidenahalli in Madhugiri Taluk, and the name Jayamangali is also used for the stream nearby. Local shepherds around the grassland report leopards attacking their dogs and mention sloth bears and wild boar, knowledge of the area that predates the official surveys.

Visiting early in the morning or late in the afternoon gives the best chance of seeing animals moving across the open ground, as they tend to rest in shaded areas during the hottest part of the day. There are no facilities inside the reserve, so bring everything you need before entering.

The reserve's first blackbuck census, run by the Wildlife Aware Nature Club with the Karnataka Forest Department on 15–16 November 1997, counted 408 animals; a second count in October 2002 found more than 600. Birders also come for the Indian courser and painted sandgrouse, and the Montagu's harrier winters here from November to January.