Jantar Mantar (Yantra Mantra) is an Indian equinoctial sundial, consisting a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis.

Jantar Mantar may also refer to:

Observatories Jantar Mantar, Jaipur, houses world's largest stone sundial, a UNESCO World Heritage site Jantar Mantar, New Delhi, it consists of 13 architectural astronomy instruments 2026 Delhi Jantar Mantar protests Jantar Mantar, Varanasi, observatory built in the year 1737 Jantar Mantar, Ujjain or Ved Shala, observatory built in the year 1725

Others Jantar Mantar (1964 film), a 1964 Indian Hindi-language film Jantar-Mantar, public art work by sculptor Narendra Patel, located on the campus of the University of Wisconsin–Milwaukee Jantar Mantar (horse), a Japanese thoroughbred racehorse "Janthar Manthar", a song by Mani Sharma, Ranjith and Rita from the 2008 Indian film Kantri

See also Jantar (disambiguation) Mantar (disambiguation)