❓ How many Upanishads are there, what are their names, and who is their author?

In Hindu tradition, a list of 108 Upanishads is famous, originating from the Muktika Upanishad. Their names are as follows:

1. Isha Upanishad
2. Kena Upanishad
3. Katha Upanishad
4. Prashna Upanishad
5. Mundaka Upanishad
6. Mandukya Upanishad
7. Taittiriya Upanishad
8. Aitareya Upanishad
9. Chandogya Upanishad
10. Brihadaranyaka Upanishad
11. Brahma Upanishad
12. Kaivalya Upanishad
13. Jabala Upanishad
14. Shvetashvatara Upanishad
15. Hamsa Upanishad
16. Aruneya Upanishad
17. Garbha Upanishad
18. Narayana Upanishad
19. Paramahamsa Upanishad
20. Amrita-bindu Upanishad
21. Amrita-nada Upanishad
22. Atharvashira Upanishad
23. Atharvashikha Upanishad
24. Maitrayani Upanishad
25. Kaushitaki Upanishad
26. Brihajjabala Upanishad
27. Nrisimhatapani Upanishad
28. Kalagnirudra Upanishad
29. Maitreyi Upanishad
30. Subala Upanishad
31. Kshurika Upanishad
32. Mantrika Upanishad
33. Sarvasara Upanishad
34. Niralamba Upanishad
35. Shukla-rahasya Upanishad
36. Vajrasuchi Upanishad
37. Tejo-bindu Upanishad
38. Nada-bindu Upanishad
39. Dhyana-bindu Upanishad
40. Brahmavidya Upanishad
41. Yogatattva Upanishad
42. Atmabodha Upanishad
43. Naradaparivrajaka Upanishad
44. Trishikhi Upanishad
45. Sita Upanishad
46. Yogachudamani Upanishad
47. Nirvana Upanishad
48. Mandalabrahmana Upanishad
49. Dakshinamurti Upanishad
50. Sharabha Upanishad
51. Skanda Upanishad
52. Mahanarayana Upanishad
53. Advayataraka Upanishad
54. Ramarahasya Upanishad
55. Ramatapani Upanishad
56. Vasudeva Upanishad
57. Mudgala Upanishad
58. Shandilya Upanishad
59. Paingala Upanishad
60. Bhikshuka Upanishad
61. Mahat Upanishad
62. Shariraka Upanishad
63. Yogashikha Upanishad
64. Turiyatita Upanishad
65. Sannyasa Upanishad
66. Paramahamsa-parivrajaka Upanishad
67. Akshamalika Upanishad
68. Avyakta Upanishad
69. Ekakshara Upanishad
70. Annapurna Upanishad
71. Surya Upanishad
72. Akshi Upanishad
73. Adhyatma Upanishad
74. Kundika Upanishad
75. Savitri Upanishad
76. Atma Upanishad
77. Pashupata Upanishad
78. Parabrahma Upanishad
79. Avadhuta Upanishad
80. Tripuratapini Upanishad
81. Devi Upanishad
82. Tripura Upanishad
83. Katharudra Upanishad
84. Bhavana Upanishad
85. Rudrahridaya Upanishad
86. Yogakundalini Upanishad
87. Bhasma Upanishad
88. Rudraksha Upanishad
89. Ganapati Upanishad
90. Darshana Upanishad
91. Tarsara Upanishad
92. Mahavakya Upanishad
93. Panchabrahma Upanishad
94. Pranagnihotra Upanishad
95. Gopalatapani Upanishad
96. Krishna Upanishad
97. Yajnavalkya Upanishad
98. Varaha Upanishad
99. Shatyayani Upanishad
100. Hayagriva Upanishad
101. Dattatreya Upanishad
102. Garuda Upanishad
103. Kalisantaran Upanishad
104. Jabala Upanishad (Samaveda)
105. Saubhagya Upanishad
106. Sarasvatirahasya Upanishad
107. Bahvricha Upanishad
108. Muktika Upanishad

The Upanishads are considered a part of the Shruti tradition of the Vedas. Therefore, no single human author is attributed to them. In Vedic tradition, they are regarded as knowledge received by sages and passed down through the Guru-Shishya tradition.