Bookanakere Siddalingappa Yediyurappa, often referred to by his initials BSY, is an Indian politician. He is currently serving as a member of the Bharatiya Janata Party (BJP) Parliamentary board committee since 17 August 2022, termed as the highest office of authority in the party. He served as the 13th Chief Minister of Karnataka, and he was former Member of the Karnataka Legislative Assembly between 1983 - 2022 in different timelines. He is a member of the Bharatiya Janata Party. He is also the only politician so far in Karnataka to have served four times as the Chief Minister and three times as the Leader of the Opposition in the Karnataka Legislative Assembly. He is the longest serving BJP Chief Minister of Karnataka. He is former MLA from Shikaripura constituency in Shimoga district, from where he has been elected eight times.

The Karnataka Legislative Assembly is the lower house of the bicameral legislature of the southern Indian state of Karnataka. Karnataka is one of the six states in India where the state legislature is bicameral, comprising two houses: the Vidhan Sabha and the Vidhan Parishad.