Konijeti Rosaiah (born 4 July 1933) is an Indian politician who was Chief Minister of Andhra Pradesh from 2009 to 2010 and Governor of Tamil Nadu from 2011 to 2016. He was previously an MLC, MLA and MP from the Indian National Congress numerous times and handled many ministerial posts over his long political career spanning over half a century. He is one of the most experienced political leaders in the state of Andhra Pradesh and his role as the Finance minister is very well recognized.

While serving as Governor of Tamil Nadu, he was also given additional responsibility as Governor of Karnataka when Governor H. R. Bhardwaj's term ended on 28 June 2014, until Vajubhai Vala took over on 1 September 2014.

Rosaiah is a political disciple of Swatantra Party leader and independence activist N.G. Ranga. He was elected as MLC in 1968, 1974, 1980 and 2009 and as an MLA in 1989 and 2004 from Chirala assembly constituency. In 1998, he was elected as MP from Narasaraopet. During his long political career he interacted and worked closely with most of the Prime Ministers of India, including Jawaharlal Nehru.

Rosaiah was the President of the Andhra Pradesh Congress Committee (APCC) from 1994 to 1996.

Rosaiah presented the state budget 16 times, including 7 times in a row, a record in the country. He served as a finance minister under Marri Chenna Reddy, Kotla Vijaya Bhaskara Reddy, Nedurumalli Janardhana Reddy and Y. S. Rajashekhara Reddy. In his tenure as Finance Minister in Chenna Reddy's cabinet, he ensured that teachers received retirement benefits. Rosaiah is well known for adhering to strict fiscal management principles and effective mobilization & utilization of government funds. His contribution to the state as its longest serving finance minister are well recognized.

Rosaiah took over as the Chief Minister after the death of Y. S. Rajashekhara Reddy. In his tenure, Rosaiah strived to bring political stability to the state and continue all the welfare programs planned and initiated by his predecessor. He is often credited for the effective management of the flood situation during October 2009, the law and order situation with respect to the Telangana agitation which started in December 2010, effective budgetary management, streamlining of the delivery systems of welfare programs etc. He submitted his resignation as Chief Minister to the Governor of Andhra Pradesh, ESL Narasimhan on 24 June 2011 citing health reasons.

Andhra University conferred him with an honorary doctorate in 2007.