The 2013 Karnataka Legislative Assembly election was held on 5 May 2013 to elect members from 223 constituencies in the Indian state of Karnataka. The election for the Piriyapatna constituency was postponed to 28 May 2013 due to the death of the BJP candidate for the seat. The voter turnout in the state was 70.23%.

The Bharatiya Janata Party is a political party in India and one of the two major Indian political parties alongside the Indian National Congress. Since 2014, it has been the ruling political party in India under the incumbent Prime Minister Narendra Modi. The BJP is aligned with right-wing politics and has close ideological and organisational links to the Rashtriya Swayamsevak Sangh (RSS) volunteer paramilitary organisation. Its policies adhere to Hindutva, a Hindu nationalist ideology. As of January 2024, it is the country's biggest political party in terms of representation in the Parliament of India as well as state legislatures.