Exhibit 10.1

EXTENSION AGREEMENT
(Extension of Maturity Date Pursuant to Section 2.15 of the Credit Agreement)
This EXTENSION AGREEMENT (this “Agreement”) dated as of June 18, 2018 (the
“Extension Effective Date”) is entered into by and among ONEOK, INC., an
Oklahoma corporation (“Borrower”), ONEOK PARTNERS INTERMEDIATE LIMITED
PARTNERSHIP, a Delaware limited partnership (“Intermediate Partnership”), and
ONEOK PARTNERS, L.P., a Delaware limited partnership, (“Partners”, and together
with Intermediate Partnership, the “Guarantors”), the undersigned Lenders (as
defined in the Credit Agreement) (the “Consenting Lenders”), and CITIBANK, N.A.,
as Administrative Agent (in such capacity, the “Administrative Agent”), Swing
Line Lender and L/C Issuer. Capitalized terms used herein and not otherwise
defined herein shall have the meanings attributed to them in the Credit
Agreement (as hereinafter defined).

R E C I T A L S

A.    Reference is made to Credit Agreement effective as of April 18, 2017 among
the Borrower, the Administrative Agent and the Lenders (as amended, restated,
supplemented or otherwise modified from time to time, the “Credit Agreement”).

B.    This Agreement is being executed to evidence Borrower’s requested
extension of the Maturity Date from June 30, 2022 to June 30, 2023 pursuant to
Section 2.15 of the Credit Agreement (the “Extension”).

C.    Each of the Consenting Lenders is entering into this Agreement in order to
evidence its consent to the Extension.

NOW, THEREFORE, the parties hereto agree as follows:

1.Consent to Extension. Subject to the satisfaction of the conditions precedent
set forth in Paragraph 2 below, each Consenting Lender hereby consents to the
Extension, and effective as of the Extension Effective Date, the Maturity Date
applicable to each Consenting Lender is June 30, 2023.

2.    Conditions Precedent to Effectiveness. This Agreement and the Extension
shall be effective as of the date hereof, provided that the Administrative Agent
shall have received the following (a) counterparts of this Agreement, executed
by the Borrower, the Guarantors, and Lenders holding more than 50% of the
Aggregate Commitments (calculated in accordance with Section 2.15 of the Credit
Agreement), (b) a certificate of the Borrower dated as of the date hereof
containing the certifications required by Section 2.15(f)(i) of the Credit
Agreement, and (c) a fee in the amount separately agreed by the Borrower, for
the account of each Consenting Lender.

3.    Affirmation and Ratification of Loan Documents. The Borrower and the
Guarantors each hereby (a) ratifies and affirms each Loan Document to which it
is a party (as modified by the Extension), (b) agrees that all of its
obligations and covenants under each Loan Document to which it is a party shall
remain unimpaired by the execution and delivery of this Agreement and the other
documents and instruments executed in connection herewith, and (c) agrees that
each Loan Document to which it is a party (as modified by the Extension) shall
remain in full force and effect. This Agreement is a Loan Document.

4.    Miscellaneous. (a) Headings and captions may not be construed in
interpreting provisions; (b) this Agreement shall be governed by, and construed
in accordance with, the law of the State of New York; and (c) this Agreement may
be executed in any number of counterparts, and by the

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different parties hereto on separate counterparts, with the same effect as if
all signatories had signed the same document, and all of those counterparts must
be construed together to constitute the same document. Delivery of an executed
signature page by facsimile or other electronic transmission shall be effective
as delivery of a manual executed counterpart.

5.    ENTIRE AGREEMENT. THE CREDIT AGREEMENT AND THE OTHER LOAN DOCUMENTS,
TOGETHER WITH THIS AGREEMENT, REPRESENT THE FINAL AGREEMENT BETWEEN THE PARTIES
AND MAY NOT BE COTRADICTED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT
ORAL AGREEMENTS OF THE PARTIES. THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN
THE PARTIES.

[Signature Pages to Follow]

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IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly
executed as of the date first above written.

ONEOK, INC.

By:
/s/ Walter S. Hulse III
Name:
Walter S. Hulse III
Title:
Chief Financial Officer, Executive Vice
President, Strategic Planning and Corporate Affairs
 
 
ONEOK PARTNERS, L.P.

By:
ONEOK Partners GP, L.L.C., its
sole general partner
 
 
By:
/s/ Walter S. Hulse III
Name:
Walter S. Hulse III
Title:
Chief Financial Officer, Executive Vice
President, Strategic Planning and Corporate Affairs
 
 
ONEOK PARTNERS INTERMEDIATE
LIMITED PARTNERSHIP

By:
ONEOK ILP GP, L.L.C.,
its sole General Partner
 
 
By:
/s/ Walter S. Hulse III
Name:
Walter S. Hulse III
Title:
Chief Financial Officer, Executive Vice
President, Strategic Planning and Corporate Affairs

Signature Page
to Extension Agreement

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CITIBANK, N.A.,
as Administrative Agent

 
 
By:
/s/ Maureen P. Maroney
 
Name:
Title:
Maureen P. Maroney
Vice President

Signature Page
to Extension Agreement

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CITIBANK, N.A.,
as a Lender, L/C Issuer and Swing Line Lender

 
 
By:
/s/ Maureen P. Maroney
 
Name:
Title:
Maureen P. Maroney
Vice President

Signature Page
to Extension Agreement

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BARCLAYS BANK PLC,
as a Lender and L/C Issuer

 
 
By:
/s/ Sydney G. Dennis
 
Name:
Title:
Sydney G. Dennis
Director

Signature Page
to Extension Agreement

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JPMORGAN CHASE BANK, N.A.,
as a Lender and L/C Issuer

 
 
By:
/s/ Orlando Castaneda
 
Name:
Title:
Orlando Castaneda
Authorized Officer

Signature Page
to Extension Agreement

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BANK OF AMERICA, N.A.,
as a Lender, L/C Issuer and Swing Line Lender

 
 
By:
/s/ Kimberly Miller
 
Name:
Title:
Kimberly Miller
Vice President

Signature Page
to Extension Agreement

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MIZUHO BANK, LTD.,
as a Lender and L/C Issuer

 
 
By:
/s/ Donna DeMagistris
 
Name:
Title:
Donna DeMagistris
Authorized Signatory

Signature Page
to Extension Agreement

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MORGAN STANLEY BANK, N.A.,
as a Lender and L/C Issuer

 
 
By:
/s/ Michael King
 
Name:
Title:
Michael King
Authorized Signatory

Signature Page
to Extension Agreement

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WELLS FARGO BANK, NATIONAL
ASSOCIATION,
as a Lender and L/C Issuer

 
 
By:
/s/ Amy Marchbanks
 
Name:
Title:
Amy Marchbanks
Assistant Vice President

Signature Page
to Extension Agreement

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CREDIT SUISSE AG, CAYMAN ISLANDS
BRANCH,
as a Lender

 
 
By:
/s/ Nupur Kumar
 
Name:
Title:
Nupur Kumar
Authorized Signatory
 
 
 
By:
/s/ Sophie Bulliard
 
Name:
Title:
Sophie Bulliard
Authorized Signatory

Signature Page
to Extension Agreement

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THE BANK OF NOVA SCOTIA,
HOUSTON BRANCH
as a Lender

 
 
By:
/s/ Alfredo Brahim
 
Name:
Title:
Alfredo Brahim
Director

Signature Page
to Extension Agreement

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THE TORONTO-DOMINION BANK, NEW YORK
BRANCH
as a Lender

 
 
By:
/s/ SAVO BOZIC
 
Name:
Title:
SAVO BOZIC
AUTHORIZED SIGNATORY

Signature Page
to Extension Agreement

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MUFG BANK, LTD., formerly know as THE BANK
OF TOKYO-MITSUBISHI UFJ, LTD.,
as a Lender

 
 
By:
/s/ Stephen W.Warfel
 
Name:
Title:
Stephen W. Warfel
Managing Director

Signature Page
to Extension Agreement

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GOLDMAN SACHS BANK USA,
as a Lender

 
 
By:
/s/ Rebecca Kratz
 
Name:
Title:
Rebecca Kratz
Authorized Signatory

Signature Page
to Extension Agreement

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PNC BANK, NATIONAL ASSOCIATION,
as a Lender

 
 
By:
/s/ Stephen Monto
 
Name:
Title:
Stephen Monto
Senior Vice President

Signature Page
to Extension Agreement

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U.S BANK NATIONAL ASSOCIATION,
as a Lender

 
 
By:
/s/ John Prigge
 
Name:
Title:
John Prigge
Senior Vice President

Signature Page
to Extension Agreement

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BRANCH BANKING AND TRUST COMPANY,
as a Lender

 
 
By:
/s/ Lincoln LaCour
 
Name:
Title:
Lincoln LaCour
Vice President

Signature Page
to Extension Agreement

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DEUTSCHE BANK AG NEW YORK BRANCH,
as a Lender
 
 
By:
/s/ Ming K Chu
 
Name:
Title:
Ming K Chu
Director
 
 
 
By:
/s/ Virginia Cosenza
 
Name:
Title:
Virginia Cosenza
Vice President

Signature Page
to Extension Agreement

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ROYAL BANK OF CANADA,
as a Lender

 
 
By:
/s/ James R. Allred
 
Name:
Title:
James R. Allred
Authorized Signatory

Signature Page
to Extension Agreement

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SUMITOMO MITSUI BANKING CORPORATION,
as a Lender

 
 
By:
/s/ James D. Weinstein
 
Name:
Title:
James D. Weinstein
Managing Director

Signature Page
to Extension Agreement

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REGIONS BANK,
as a Lender

 
 
By:
/s/ Brian Walsh
 
Name:
Title:
Brian Walsh
Director

Signature Page
to Extension Agreement

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BOKF NA, DBA BANK OF OKLAHOMA,
as a Lender

 
 
By:
/s/ Nick Cooper
 
Name:
Title:
Nick Cooper
Senior Vice President

Signature Page
to Extension Agreement

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ARVEST BANK,
as a Lender

 
 
By:
/s/ Rick Gaut
 
Name:
Title:
Rick Gaut
SVP, Commercial Loan Manager

Signature Page
to Extension Agreement