Lakshmi Kumara Thathachariar, Saint Lakshmi Kumara Thatha Desikan, or Acharya Thathachariar Tamil: ஸ்ரீ லக்ஷ்மீ குமார தாத தேசிகன்) (1571–1643) was a prominent Vaishnava saint and Guru in the Hindu tradition in Vaishnavism, India. Sri Lakshmi Kumara Thatha Desikan was a devotee of Lord Narayana specially Lord Rama and the Vaishnava Guru /acharya Swamy Vedanta Desika. He has the title Kottikannikadhana Thirumalai Edur Immadi Royadurgam Sri Lakshmi Kumara Thatha Desikan. He was the Royal Preceptor "Raja Guru" of king of Vijayanagar Empire . He was the "Manager-General" of the Divya Desam Temples including Sri Rangam, Kanchipuram, Tirumala, Melkote, Srivilliputtur. He is recorded as one of the greatest Aacharyas in the lineage of Sri Ramanuja's Vaishnavism.