Company: NYXH
Filing Date: 2025-09-08
Form Type: 6-K
Source: 0001104659-25-088240
Chunk: 0

Company: Nyxoah SA
Filing Date: 2025-09-08
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2025

Commission File Number: 001-40552

NYXOAH SA

(Translation of registrant’s name into English)

Rue Edouard Belin 12, 1435 Mont-Saint-Guibert, Belgium

(Address of principal executive office)</div>

Indicate by check mark whether the registrant
files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x Form 40-F ¨

Indicate by check mark if the registrant is submitting
the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Note: Regulation S-T Rule 101(b)(1) only
permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting
the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Note: Regulation S-T Rule 101(b)(7) only
permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private
issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally
organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s
securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed
to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission
or other Commission filing on EDGAR.

<div align='center'>Nyxoah SA</div>

On September 5, 2025, Nyxoah SA (the “Company”)
issued a press release, a copy of which is attached hereto as Exhibit 99.1.

The information in the attached Exhibit 99.1 is being furnished and shall not