Gudalur is a state assembly constituency in Nilgiris district in Tamil Nadu. Its State Assembly Constituency number is 109. It was created from changes made to the Udagamandalam constituency in 1967 and was initially reserved for candidates from the Scheduled Castes. The reservation criteria ceased in 1977 but were reinstated for the 2011 elections. In between, the 2008 boundary changes had made it smaller. It is one of the 234 State Legislative Assembly Constituencies in Tamil Nadu, in India. It comes under Nilgiris Lok Sabha constituency.