2 Added pranami sect with links.
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Gaudiya Vaishnavas believe Lord Krishna is the Supreme Brahman and Brahma Samhita also describes the same.

Brahma Samhita 5.1:

īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ
anādir ādir govindaḥ sarva-kāraṇa-kāraṇam

Translation: Kṛṣṇa who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.

The above verse describes Lord Krishna is the origin of everything and all the other verses glorifies Him.

Why do they Gaudiya Vaishnavas believe in Brahma Samhita?

Because Brahma Samhita is one of the Pancharatra texts which are most popular among Vaishnavas.

Here is the list of Pancharatra agamas from wiki:

Agastya-Samhita, Aniruddha-Samhita, Ahirbudhnya Samhita, Brahma Samhita, Brihat-Brahma-Samhita, Isvara-Samhita, Kapinjala-Samhita, Garga Samhita, Gautama-Samhita, Citrasikhandi-Samhita, Jayakhya-Samhita.... (mentioned few from list)

It is also believed that there were 100 chapters in the Brahma Samhita. This 5th chapter is the only chapter available now and was discovered by Chaitanya.

And not only Gaudiya Vaishnavas but Nimbarka sect, Vallabhacharya sect, Pranami sect and Radha Vallabha sectRadha Vallabha sect also worship Lord Krishna as Supreme.

Gaudiya Vaishnavas believe Lord Krishna is the Supreme Brahman and Brahma Samhita also describes the same.

Brahma Samhita 5.1:

īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ
anādir ādir govindaḥ sarva-kāraṇa-kāraṇam

Translation: Kṛṣṇa who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.

The above verse describes Lord Krishna is the origin of everything and all the other verses glorifies Him.

Why do they Gaudiya Vaishnavas believe in Brahma Samhita?

Because Brahma Samhita is one of the Pancharatra texts which are most popular among Vaishnavas.

Here is the list of Pancharatra agamas from wiki:

Agastya-Samhita, Aniruddha-Samhita, Ahirbudhnya Samhita, Brahma Samhita, Brihat-Brahma-Samhita, Isvara-Samhita, Kapinjala-Samhita, Garga Samhita, Gautama-Samhita, Citrasikhandi-Samhita, Jayakhya-Samhita.... (mentioned few from list)

It is also believed that there were 100 chapters in the Brahma Samhita. This 5th chapter is the only chapter available now and was discovered by Chaitanya.

And not only Gaudiya Vaishnavas but Nimbarka sect, Vallabhacharya sect and Radha Vallabha sect also worship Lord Krishna as Supreme.

Gaudiya Vaishnavas believe Lord Krishna is the Supreme Brahman and Brahma Samhita also describes the same.

Brahma Samhita 5.1:

īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ
anādir ādir govindaḥ sarva-kāraṇa-kāraṇam

Translation: Kṛṣṇa who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.

The above verse describes Lord Krishna is the origin of everything and all the other verses glorifies Him.

Why do they Gaudiya Vaishnavas believe in Brahma Samhita?

Because Brahma Samhita is one of the Pancharatra texts which are most popular among Vaishnavas.

Here is the list of Pancharatra agamas from wiki:

Agastya-Samhita, Aniruddha-Samhita, Ahirbudhnya Samhita, Brahma Samhita, Brihat-Brahma-Samhita, Isvara-Samhita, Kapinjala-Samhita, Garga Samhita, Gautama-Samhita, Citrasikhandi-Samhita, Jayakhya-Samhita.... (mentioned few from list)

It is also believed that there were 100 chapters in the Brahma Samhita. This 5th chapter is the only chapter available now and was discovered by Chaitanya.

And not only Gaudiya Vaishnavas but Nimbarka sect, Vallabhacharya sect, Pranami sect and Radha Vallabha sect also worship Lord Krishna as Supreme.

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source | link

Gaudiya Vaishnavas believe Lord Krishna is the Supreme Brahman and Brahma Samhita also describes the same.

Brahma Samhita 5.1:

īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ
anādir ādir govindaḥ sarva-kāraṇa-kāraṇam

Translation: Kṛṣṇa who is known as Govinda is the Supreme Godhead. He has an eternal blissful spiritual body. He is the origin of all. He has no other origin and He is the prime cause of all causes.

The above verse describes Lord Krishna is the origin of everything and all the other verses glorifies Him.

Why do they Gaudiya Vaishnavas believe in Brahma Samhita?

Because Brahma Samhita is one of the Pancharatra texts which are most popular among Vaishnavas.

Here is the list of Pancharatra agamas from wiki:

Agastya-Samhita, Aniruddha-Samhita, Ahirbudhnya Samhita, Brahma Samhita, Brihat-Brahma-Samhita, Isvara-Samhita, Kapinjala-Samhita, Garga Samhita, Gautama-Samhita, Citrasikhandi-Samhita, Jayakhya-Samhita.... (mentioned few from list)

It is also believed that there were 100 chapters in the Brahma Samhita. This 5th chapter is the only chapter available now and was discovered by Chaitanya.

And not only Gaudiya Vaishnavas but Nimbarka sect, Vallabhacharya sect and Radha Vallabha sect also worship Lord Krishna as Supreme.