Idar State in Gujarat was a native state of India. Idar State was formed as a part of the Mahi Kantha Agency, within the Gujarat Division of Mumbai (Bombay).

Idar State has an area of 1669 square miles and a population (1901) of 168,557, showing a decrease of 44% in the decade as the result of famine. In the year 1901, the ruler of Idar state and his posthumous son both died, and the succession devolved upon Pratap Singh of Idar, Jodhpur. The line of railway from Ahmedabad through Parantij runs mainly through this state.

Much of the territory of Idar State is held by kinsmen of the raja on feudal tenure. The products are grain, oil-seeds and sugar-cane. In 1941, the Idar State had a population of 307,798.

Idar was once ruled by Rajput kings. In 1924 it was made part of the Western India States Agency. Later Idar State was transferred to the Rajputana States in the early 1940s. In 1949 it was dissolved and split between Sabarkantha district and Mehsana district which were at that point in Bombay State. Both these districts were included in Gujarat when it was formed in 1960.

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