Company: RGNT
Filing Date: 2025-12-18
Form Type: 6-K
Source: 0001213900-25-123065
Chunk: 0

Company: REGENTIS BIOMATERIALS LTD.
Filing Date: 2025-12-18
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 December 2025

Commission file number: 001-42834

REGENTIS BIOMATERIALS LTD.

(Translation of registrant’s name into English)

60 Medinat Hayehudim Street, 4676652, Israel

(Address of principal executive offices)</div>

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

<div align='center'>Form 20-F ☒
Form 40-F ☐

CONTENTS</div>

Attached hereto and incorporated
herein is the registrant’s press release issued on December 18, 2025, titled “Regentis Biomaterials Granted New U.S. Patent
for its Off-the-Shelf Regenerative Cartilage Repair Product GelrinC.”

A copy of the press release
is furnished herewith as Exhibit 99.1 and incorporated herein by reference.

<div align='center'>1

EXHIBIT INDEX</div>

| Exhibit No. |     |                                                                                                                                           |
| 99.1        |     | Press release titled: “Regentis Biomaterials Granted New U.S. Patent for its Off-the-Shelf Regenerative Cartilage Repair Product GelrinC” |

<div align='center'>2

SIGNATURES</div>

Pursuant to the requirements
of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto
duly authorized.

| Date: December 18, 2025 | Regentis Biomaterials Ltd. 
 By:                        | /s/ Ehud Geller |
|:------------------------|:---------------------------|:----------------|
|                         | Name:                      | Ehud Geller     |
|                         | Title:                     | Chairman        |

<div align='center'>3</div>