Exhibit 5.1

	ArentFox Schiff LLP
	1717 K Street, NW Washington,
	DC 20006
	202.857.6000        MAIN
	202.857.6395        FAX
	afslaw.com

September 15, 2026

Intelligent Bio Solutions Inc.

135 West 41st Street, 5th Floor

New York, NY 10036

Ladies and Gentlemen:

We have acted as counsel to Intelligent Bio Solutions Inc., a Delaware corporation (the “Company”), in connection with a registration statement on Form S-3 (the “Registration Statement”), filed by the Company on September 15, 2026, with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”). The Registration Statement relates to the registration for resale by the selling stockholders named in the Registration Statement (the “Selling Stockholders”) of up to (i) 2,036,659 shares of the Company’s common stock, $0.01 par value per share (“Common Stock”) issuable upon the exercise of certain outstanding Series M Pre-Funded Warrants to purchase Common Stock (the “Pre-Funded Warrants”), (ii) 2,036,659 shares of Common Stock issuable upon the exercise of certain outstanding Series N-1 Common Stock Purchase Warrants (the “Series N-1 Warrants”), (iii) 2,036,659 shares of Common Stock issuable upon the exercise of certain outstanding Series N-2 Common Stock Purchase Warrants (the “Series N-2 Warrants”), and (iv) 101,832 shares of Common Stock issuable upon the exercise of certain outstanding warrants to purchase Common Stock issued to the Placement Agent (defined below) or its designees (the “Placement Agent Warrants”). The Pre-Funded Warrants, Series N-1 Warrants, Series N-2 Warrants, and the Placement Agent Warrants are referred to collectively herein as the “Warrants” and the shares of Common Stock issuable upon exercise of the Warrants are referred to herein as the “Warrant Shares.” The Pre-Funded Warrants, Series N-1 Warrants and Series N-2 Warrants were sold to the Selling Stockholder holding such warrants pursuant to that certain Securities Purchase Agreement (the “Purchase Agreement”) dated August 31, 2026, between the Company and the investor identified therein; and the Placement Agent Warrants were issued to the Selling Stockholders holding the Placement Agent Warrants pursuant to that certain Placement Agency Agreement (the “Placement Agency Agreement”) dated August 31, 2026, between the Company and Ladenburg Thalmann & Co. Inc. (the “Placement Agent”).

In connection with our opinion, we have examined the Registration Statement, including the exhibits thereto, the Warrants, and such other documents, corporate records and instruments, and have examined such laws and regulations, as we have deemed necessary for the purposes of this opinion. In making our examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity with the originals of all documents submitted to us as copies and the legal capacity of all natural persons. As to matters of fact material to our opinions in this letter, we have relied on certificates and statements from officers and other employees of the Company, public officials and other appropriate persons.

Smart In
Your World^®

Intelligent Bio Solutions Inc. September 15, 2026 Page 2

Based on the foregoing and subject to the qualifications set forth below, we are of the opinion that:

The foregoing opinions are limited to the General Corporation Law of Delaware (which includes those statutory provisions and all applicable provisions of the Delaware Constitution and the reported judicial decisions interpreting such laws) and the federal laws of the United States of America, and we express no opinion as to the laws of any other jurisdiction.

The opinions expressed in this opinion letter are as of the date of this opinion letter only and as to laws covered hereby only as they are in effect on that date, and we assume no obligation to update or supplement such opinion to reflect any facts or circumstances that may come to our attention after that date or any changes in law that may occur or become effective after that date. The opinions herein are limited to the matters expressly set forth in this opinion letter, and no opinion or representation is given or may be inferred beyond the opinions expressly set forth in this opinion letter.

We hereby consent to the filing of this opinion with the Commission as an exhibit to the Registration Statement and to the use of this firm’s name under the caption “Legal Matters” in the Registration Statement. In giving this consent, we do not thereby admit that we are within the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission promulgated thereunder.

Sincerely,

/s/ ArentFox Schiff LLP

ARENTFOX SCHIFF LLP