Adi Sankaracharya (788-821 CE) was a great saint & philosopher who consolidated the doctrine of Advaita Vedanta, a sub-school of Vedanta. His teachings are based on the unity of the soul and Brahman, in which Brahman is viewed as without attributes. He hailed from Kalady of present day Kerala. Sankara travelled across India and other parts of South Asia to propagate his philosophy through discourses and debates with other thinkers. He founded four mathas (monasteries), which helped in the historical development, revival and spread of Advaita Vedanta. Adi Sankara is believed to be the organizer of the Dasanami monastic order and the founder of the Shanmata tradition of worship.

His works in Sanskrit concern themselves with establishing the doctrine of Advaita (Non-dualism). He also established the importance of monastic life as sanctioned in the Upanishads and Brahma Sutra, in a time when the Mimamsa school established strict ritualism and ridiculed monasticism. Sankara represented his works as elaborating on ideas found in the Upanishads, and he wrote copious commentaries on the Vedic Canon (Brahma Sutra, Principal Upanishads and Bhagavadgita) in support of his thesis. The main opponent in his work is the Mimamsa school of thought, though he also offers some arguments against the views of some other schools like Samkhya and certain schools of Buddhism that he was partly familiar with.

The Works of Sri Sankaracharya [Memorial Edition], 20 volumes published in 1910 by Sri Vani Vilas Press, Srirangam, remains to this day the standard collection of the complete works of Sri Sankaracharya. It includes Sri Sankaracharya's major commentaries as well as his other works, as given in the list below.

1. Brahmasutra-bhashya
2. Brahmasutra-bhashya
3. Brahmasutra-bhashya
4. Upanishad-bhashya, vol. 1: Isa, Kena [2], Katha, Prasna
5. Upanishad-bhashya, vol. 2: Mundaka, Mandukya, Aitareya
6. Upanishad-bhashya, vol. 3: Taittiriya, Chhandogya 1-3
7. Upanishad-bhashya, vol. 4: Chhandogya 4-8
8. Upanishad-bhashya, vol. 5: Brihadaranyaka 1-2
9. Upanishad-bhashya, vol. 6: Brihadaranyaka 3-4
10. Upanishad-bhashya, vol. 7: Brihadaranyaka 5-6, Nrisimhapurvatapani
11. Bhagavad-Gita-bhashya, vol. 1: chaps. 1-9
12. Bhagavad-Gita-bhashya, vol. 2: chaps. 10-18
13. Vishnusahasranama and Sanatsujatiya Bhashyas
14. Vivekachudamani, Upadeshasahasri
15. Miscellaneous Prakaranas vol. 1: Aparokshanubhuti, etc. [7 works]
16. Miscellaneous Prakaranas vol. 2: Prabodhasudhakara, etc. [25 works]
17. Stotras, vol. 1 [30 works]
18. Stotras, vol. 2 [35 works, plus Lalita Trisatistotra Bhashya]
19. Prapanchasara, vol. 1
20. Prapanchasara, vol. 2

There are thus a total of 118 works, counting the two Kena Upanishad bhashyas separately, in this collection. Both Indian and Western scholars agree that many of these works must have been written by later Sankaracharyas rather than the original or
Adi Sankaracharya. But there is no agreement on which ones are genuinely his. Moreover, there are many other texts attributed to Sankaracharya that are not found in this collection, some of which may have been written by Adi Sankaracharya. So it is not a definitive collection of his writings. Nor does it lay any claim to being a critical edition. Its readings can often be improved by comparison with other printed editions and manuscripts. It is
simply the standard collection we have at present.

A detailed article on the bibliography of "Collected Works of Sri Sankaracharya" is available at this web-page.

DOWNLOAD LINKS - Works of Sri Sankaracharya - 20 Volumes (1910 Edition)

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Or In Separate Volumes

Works of Sri Sankaracharya Volume 01
Works of Sri Sankaracharya Volume 02
Works of Sri Sankaracharya Volume 03
Works of Sri Sankaracharya Volume 04
Works of Sri Sankaracharya Volume 05
Works of Sri Sankaracharya Volume 06
Works of Sri Sankaracharya Volume 07
Works of Sri Sankaracharya Volume 08
Works of Sri Sankaracharya Volume 09
Works of Sri Sankaracharya Volume 10
Works of Sri Sankaracharya Volume 11
Works of Sri Sankaracharya Volume 12
Works of Sri Sankaracharya Volume 13
Works of Sri Sankaracharya Volume 14
Works of Sri Sankaracharya Volume 15
Works of Sri Sankaracharya Volume 16
Works of Sri Sankaracharya Volume 17
Works of Sri Sankaracharya Volume 18
Works of Sri Sankaracharya Volume 19
Works of Sri Sankaracharya Volume 20

The whole set is also available at www.archive.org

Works of Sankaracharya with Hindi Translation

Aitareya Upanishad Sankara Bhashya with Hindi Translation - Gita Press 1938
Bhagavad Gita Sankara Bhashya with Hindi Translation - Harikrishnadas Goyandaka 1953
Brahmasutra Sankarabhashya Ratnaprabha with Hindi Translation Part 1- CP Sukla 1934
Brahmasutra Sankarabhashya Ratnaprabha with Hindi Translation Part 2- CP Sukla 1934 
Brahmasutra Sankarabhashya Ratnaprabha with Hindi Translation Part 3- CP Sukla 1936
Brihadaranyakopanishad Sankara Bhashya with Hindi Translation GIta Press 1955
Chandogyopanishad Sankara Bhashya with Hindi Translation GIta Press 1956
Isavasyopanishad Sankara Bhashya with Hindi Translation - Gita Press 1940
Kathopanishad Sankara Bhashya with Hindi Translation - Gita Press 1951
Kenopanishad Sankara Bhashya with Hindi Translation - Gita Press 1935
Mandukyopanishad & Karika with Sankara Bhashya Hindi Translation - Gita Press 1936
Mundaka Upanishad Sankara Bhashya with Hindi Translation - Gita Press 1935
Prasna Upanishad Sankara Bhashya with Hindi Translation - Gita Press 1935
Svetasvataropanishad Sankara Bhashya with Hindi Translation - Gita Press 1938
Taittiriyopanishad Sankara Bhashya with Hindi Translation - Gita Press 1936
Viveka Chudamani with Hindi Translation - Munilal Gupta (Gita Press)
Aparokshanubhuti with Dipika & Hindi Tika - Ramswarup Dvivedi 1908
Panchikaranam with Hindi Tika - Mahadeva Sarma Pandey 1941
Prabodhasudhakara with Hindi Translation - Munilal Gupta 1936
Sanatasujatiyam Sankarabhashya with Hindi Translation - GS Haldar 1932
Saundaryalahari with Hindi Tika - Vishnutirth Maharaj 1949
Vishnu Sahasranama Sankarabhashya with Hindi Translation 1934