As you are asking about the past spiritual Gurus of India I have the list of that for you which I would like to share with you please feel free to have a look on that

Swami Abhedananda (2 October 1866 – 8 September 1939)

Abhinavagupta (c. 950 – 1020)

A.C. Bhaktivedanta Swami Prabhupada[1] (1 September 1896 – 14 November 1977)

Adi Shankara[2] (c. 788 – 820)

Advaitanand Ji (1846 – 1919) part of Advait Mat lineage

Akhandanand[3] (25 July 1911 – 19 November 1987)

Akka Mahadevi(c.1130 – 1160), Kannada literature

Alvar Saints(700–1000)

Anandamayi Ma (30 April 1896 – 27 August 1982)

Anandmurti Gurumaa (female)[4] (b. 8 April 1966)

Andal (c.767), Tamil literature

Sri Aurobindo (15 August 1872 – 5 December 1950)

Avvaiyar (c. 1st and 2nd century AD), Tamil literature

Baba Hari Dass (b. 26 March 1923)[5]

Bahinabai (1628–1700), Marathi literature

Bhagawan Nityananda[6] (November or December 1897 – 8 August 1961)

Bhakti Tirtha Swami[7] (25 February 1950 – 27 June 2005)

Bamakhepa, or Bamakhyapa/ Bamdev Bhairav (1837 – 1911)

Swami Bhoomananda Tirtha (b. 13 May 1933)

Bijoy Krishna Goswami (2 August 1841 – 1899)

Brahma Chaitanya, also known as Gondavalekar Maharaj (1845 -22 December 1913)

Brahmanand Swami (1772–1832)

Brahmananda Saraswati[8] (20 December 1868 – 20 May 1953)

Bhakti Charu Swami (b. 17 September 1945)

Chaitanya Mahaprabhu[9] (18 February 1486 – 14 June 1534)

Sant Charandas (1703–1782)

Charan Singh (Radha Soami Sant Satguru) (12 December 1916 – 1 June 1990)

Chandrashekarendra Saraswati (20 May 1894 – 8 January 1994)

Swami Chidbhavananda (11 March 1898 – 16 November 1985)

Chinmayananda Saraswati (8 May 1916 – 3 August 1993)

Sri Chinmoy [10] (27 August 1931 – 11 October 2007)

Chokhamela (14th century)

Dayananda Saraswati, founder of Arya Samaj (12 February 1824 – 30 October 1883)

Dayananda Saraswati (Ärsha Vidya) (b. 15 August 1930)

Dnyaneshwar[11] (1275 – 1296)

Drona (mythohistorical)

Eknath (1533–1599)