State Highway 91 (SH-91) is a state highway connecting Konanur village of Hassan district and Makutta village of Kodagu, in the South Indian state of Karnataka. It has a total length of .
The highway begins at Siddapura-Gate, from Konanur, bifurcating from SH-85 and traverses in a south-southwesterly direction up to the border village of Makutta in Kodagu from where it merge with the State Highway 30 Thalassery-Coorg-Mysore road of Kerala. This highway forms a part of Madikeri-Hassan highway.
Major towns and villages on the highway are: Konanur, Kadavina Hosalli, Shirangala, Hebbale, Kanive, Kudige, Mullusoge, Kushalnagar, Guddehosur, Nanjarayapatna, Valnoor, Tyagattur, Abhyathamangala, Siddapura, Ammathi, Virajpet, Arji, Betoli and (through Brahmagiri Wildlife Sanctuary) Makutta village (Kodagu-Kannur border).