Vangal Krishnamachari Thiruvenkatachari (30 January 1904 – 23 January 1984) was an Indian lawyer who served as the Advocate-General of Madras State from 1951 to 1964. He was the eldest son of Indian civil servant Sir V. T. Krishnamachari.It was a letter written by Vangal Krishnamachari Thiruvenkatachari that became the foundation of Ninth Schedule to the Constitution of India.²