SEC Filing Document

Company: Jones Ventures INTL Acquisition1 Corp
Ticker: 
CIK: 2129056
Filing Type: S-1
Document Type: EX-5.1
Date Filed: 2026-05-15
Accession Number: 0001213900-26-057072
Exchange: 
SIC Code: 6770
SIC Description: Blank Checks
URL: https://www.sec.gov/Archives/edgar/data/2129056/000121390026057072/ea028579202ex5-1.htm

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Exhibit 5.1

Our ref	DJC/786693-000001/87410300v5

Jones Ventures INTL Acquisition1 Corp

PO Box 309, Ugland House

Grand Cayman

Cayman Islands

14 May 2026

Jones Ventures INTL Acquisition1 Corp

We have acted as counsel as to Cayman Islands
law to Jones Ventures INTL Acquisition1 Corp (the “Company”) in connection with the Company’s registration statement
on Form S-1, including all amendments or supplements thereto, filed with the United States Securities and Exchange Commission (the “Commission”)
under the United States Securities Act of 1933, as amended (the “Act”) (including its exhibits, the “Registration
Statement”) for the purposes of, registering with the Commission under the Act, the offering and sale to the public of:

(a)	up to 23,000,000 units (including 3,000,000  units, which the several underwriters (“ Underwriters ”),
for whom Jones Trading Institutional Services LLC is acting as representative (“ Representative ”), will have a 45-day
option to purchase from the Company to cover over-allotments, if any) (“ Units ”) at an offering price of US$10 per Unit,
each Unit consisting of:

(i)	one Class A ordinary share of a par value of US$0.0001 of the Company (“ Class A Ordinary Shares ”);
and

(ii)	one right to receive one-tenth of one Class A Ordinary Share upon the consummation of an initial business
combination (“ Rights ”);

(b)	all Class A Ordinary Shares and Rights issued as part of the Units; and

(c)	all Class A Ordinary Shares that may be issued upon conversion of the Rights included in the Units.

This opinion letter is given in accordance with
the terms of the Legal Matters section of the Registration Statement.

1	Documents Reviewed

We have reviewed originals, copies, drafts or
conformed copies of the following documents:

1.1	The certificate of incorporation dated 15 June 2021, the certificate of restoration dated 21 February
2025 and the memorandum and articles of association of the Company as registered or adopted on 15 June 2021 (the “ Memorandum and
Articles ”).

1.2	The written resolutions of the board of directors of the Company dated 14 May 2026 (the “ Resolutions ”).

1.3	A certificate of good standing with respect to the Company issued by the Registrar of Companies (the “ Certificate
of Good Standing ”).

1.4	A certificate from a director of the Company a copy of which is attached to this opinion letter (the “ Director’s
Certificate ”).

1.5	The Registration Statement.

1.6	A draft of the form of the unit certificate representing the Units (the “ Unit Certificate ”).

1.7	A draft of the form of the rights agreement and the rights certificate constituting the Rights (the “ Rights
Documents ”).

1.8	A draft of the underwriting agreement between the Company and the Representative.

The documents listed in paragraphs
1.6 to 1.8 inclusive above shall be referred to collectively herein as the “Documents”.

2	Assumptions

The following opinions are given only as to, and
based on, circumstances and matters of fact existing and known to us on the date of this opinion letter. These opinions only relate to
the laws of the Cayman Islands which are in force on the date of this opinion letter. In giving the following opinions, we have relied
(without further verification) upon the completeness and accuracy, as at the date of this opinion letter, of the Director’s Certificate
and the Certificate of Good Standing. We have also relied upon the following assumptions, which we have not independently verified:

2.1	The Documents have been or will be authorised and duly executed and unconditionally delivered by or on
behalf of all relevant parties in accordance with all relevant laws (other than, with respect to the Company, the laws of the Cayman Islands).

2.2	The Documents are, or will be, legal, valid, binding and enforceable against all relevant parties in accordance
with their terms under the laws of the State of New York (the “ Relevant Law ”) and all other relevant laws (other than,
with respect to the Company, the laws of the Cayman Islands).

2.3	The choice of the Relevant Law as the governing law of the Documents has been made in good faith and would
be regarded as a valid and binding selection which will be upheld by the courts of the State of New York and any other relevant jurisdiction
(other than the Cayman Islands) as a matter of the Relevant Law and all other relevant laws (other than the laws of the Cayman Islands).

2.4	Copies of documents, conformed copies or drafts of documents provided to us are true and complete copies
of, or in the final forms of, the originals.

2.5	All signatures, initials and seals are genuine.

2.6	The capacity, power, authority and legal right of all parties under all relevant laws and regulations
(other than, with respect to the Company, the laws and regulations of the Cayman Islands) to enter into, execute, unconditionally deliver
and perform their respective obligations under the Documents.

2.7	No invitation has been or will be made by or on behalf of the Company to the public in the Cayman Islands
to subscribe for any of the Units, the Rights or the Class A Ordinary Shares.

2.8	There is no contractual or other prohibition or restriction (other than as arising under Cayman Islands
law) binding on the Company prohibiting or restricting it from entering into and performing its obligations under the Documents.

2.9	No monies paid to or for the account of any party under the Documents or any property received or disposed
of by any party to the Documents in each case in connection with the Documents or the consummation of the transactions contemplated thereby
represent or will represent proceeds of criminal conduct or criminal property or terrorist property (as defined in the Proceeds of Crime
Act (As Revised) and the Terrorism Act (As Revised), respectively).

2.10	There is nothing contained in the minute book or corporate records of the Company (which, other than the
records set out in paragraphs 1.1 and 1.2 of this opinion letter, we have not inspected) which would or might affect the opinions set
out below.

2.11	There is nothing under any law (other than the laws of the Cayman Islands) which would or might affect
the opinions set out below. Specifically, we have made no independent investigation of the Relevant Law.

2.12	The Company will receive money or money’s worth in consideration for the issue of the Class A Ordinary
Shares and none of the Class A Ordinary Shares were or will be issued for less than par value.

Save as aforesaid we have not been instructed
to undertake and have not undertaken any further enquiry or due diligence in relation to the transaction the subject of this opinion letter.

3	Opinions

Based upon, and subject to, the foregoing assumptions
and the qualifications set out below, and having regard to such legal considerations as we deem relevant, we are of the opinion that:

3.1	The Company has been duly incorporated as an exempted company with limited liability and is validly existing
and in good standing with the Registrar of Companies under the laws of the Cayman Islands.

3.2	The Class A Ordinary Shares to be offered and issued by the Company as contemplated by the Registration
Statement (including the issuance of Class A Ordinary Shares upon the conversion of the Rights in accordance with the Rights Documents)
have been duly authorised for issue, and when issued by the Company against payment in full of the consideration as set out in the Registration
Statement and in accordance with the terms set out in the Registration Statement (including the issuance of Class A Ordinary Shares upon
the conversion of the Rights in accordance with the Rights Documents), such Class A Ordinary Shares will be validly issued, fully paid
and non-assessable. As a matter of Cayman Islands law, a share is only issued when it has been entered in the register of members (shareholders).

3.3	The execution, delivery and performance of the Unit Certificate and the Rights Documents have been authorised
by and on behalf of the Company and, once the Unit Certificate and the Rights Documents have been executed and delivered by any director
or officer of the Company, the Unit Certificate and the Rights Documents will be duly executed and delivered on behalf of the Company
and will constitute the legal, valid and binding obligations of the Company enforceable in accordance with their terms.

4	Qualifications

The opinions expressed above are subject to the
following qualifications:

4.1	The obligations assumed by the Company under the Documents will not necessarily be enforceable in all
circumstances in accordance with their terms. In particular:

(a)	enforcement may be limited by bankruptcy, insolvency, liquidation, reorganisation, readjustment of debts
or moratorium or other laws of general application relating to protecting or affecting the rights of creditors and/or contributories;