The Brihadaranyaka Upanishad (बृहदारण्यक उपनिषद्) is one of the Principal Upanishads and is part of Shukla Yajur Veda, which is a principal scripture of Hinduism. As the name suggests, its size is voluminous.
There are very few Hindi Translations of Brihadaranyaka Upanishad, probably because of the bulky size of the book:
Brihadaranyaka Upanishad with Shankarbhashya – Gitapress
Brihadaranyaka Upanishad with Shankarbhashya – Parayan Edition. Comes in three volumes.
Brihadaranyakopanishad with Anandgiri and Shankarbhashya – Tr by Dr. Umeshanand Shastri. It comes in two volumes.
Brihadaranyaka Vartik Saar – Swami Vidyaranya – TO BE UPLOADED SOON
Brihadaranyaka with Gudharth Deepika commentary of Dandi Swami (Vishvak Sena Acharya)
Brihadaranyakopanishad Bhashyam by Pt. Shivshankar Kavyatirth Sharma