Lakshminarayana Vaidyanathan (9 April 1942 – 19 May 2007) was an Indian musicologist, music director, and composer of classical Carnatic music. Vaidyanathan was a son of V. Lakshminarayana, a brother of L. Subramaniam and Shankar, an uncle of Gingger Shankar, Ambi Subramaniam, and Bindu Subramaniam, and a brother-in-law of Viji Subramaniam and Kavita Krishnamurthy.