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 organisation of the Bharatiya Janata Party (BJP) is based upon the Constitution of the BJP. The organisation of the BJP is strictly hierarchical, with the president being the highest authority in the party. The party is considered to be a cadre-based party that draws from the Hindutva-based ideology of its parent organisation, the RSS.