The 1985 Karnataka Legislative Assembly election was held in the Indian state of Karnataka to elect 224 members of the Karnataka Legislative Assembly. The elections resulted in a spectacular victory for the Janata Party, led by Chief minister Ramakrishna Hegde.

The Janata Party abbreviated JP, lit. People's Party) is an unrecognized political party in India. It was founded as an amalgam of Indian political parties opposed to the Emergency that was imposed between 1975 and 1977 by Prime Minister Indira Gandhi of the Indian National Congress. In the 1977 general election, the party defeated the Congress and Janata leader Morarji Desai became the first non-Congress prime minister in independent modern India's history.