Exhibit 5.1

One Atlantic Center

1201 West Peachtree Street

Atlanta, GA 30309-3424

404-881-7000

Fax: 404-253-8758

www.alston.com

May 18, 2018

Mohawk Industries, Inc.

Mohawk Capital Finance S.A.

160 South Industrial Boulevard

Calhoun, GA 30701

Ladies and Gentlemen:

We have acted as counsel to Mohawk Industries, Inc., a Delaware corporation (the “Parent Guarantor”), and Mohawk Capital Finance S.A., a societé anonyme incorporated under the laws of Grand Duchy of Luxembourg and an indirect wholly-owned subsidiary of the Parent Guarantor (the “Company”), in connection with the sale by the Company of €300,000,000 aggregate principal amount of Floating Rate Notes due 2020 (the “Notes”), to be fully and unconditionally guaranteed by the Parent Guarantor (the “Guarantee” and, together with the Notes, the “Securities”). The Securities are to be issued under the Senior Indenture dated as of September 11, 2017 among the Company, the Parent Guarantor and U.S. Bank National Association, as trustee (the “Trustee”), as supplemented by the Second Supplemental Indenture dated as of May 18, 2018 among the Company, the Parent Guarantor, the Trustee, as Trustee, Registrar and Transfer Agent, and Elavon Financial Services DAC, UK Branch, as Paying Agent and Calculation Agent (as so supplemented, the “Indenture”). The Company is selling the Notes to MUFG Securities EMEA plc (the “Underwriter”) for resale to the public pursuant to the Underwriting Agreement dated May 14, 2018 (the “Underwriting Agreement”) by and among the Company, the Parent Guarantor and the Underwriter. The Indenture, the Underwriting Agreement and the global certificate representing the Securities are referred to herein collectively as the “Transaction Documents”).

We are furnishing the opinion set forth below pursuant to Items 1.01, 2.03 and 9.01 of Form 8-K and Item 601(b)(5) of Regulation S-K of the Securities and Exchange Commission (the “Commission”).

In rendering the opinion set forth below, we have examined and relied upon the following documents:

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Mohawk Industries, Inc.

Mohawk Capital Finance S.A.

May 18, 2018

Page 2

We also have made such further legal and factual examinations and investigations as we deemed necessary for purposes of expressing the opinion set forth herein.

As to factual matters relevant to this opinion letter that we did not independently establish or verify, we have relied conclusively upon the representations and warranties made in the Transaction Documents by the parties thereto and originals or copies, certified or otherwise identified to our satisfaction, of such other records, agreements, documents and instruments, including certificates or comparable documents of officers of the Company and the Parent Guarantor and of public officials, as we have deemed appropriate as a basis for the opinion hereinafter set forth. Except to the extent expressly set forth herein, we have made no independent investigations with regard to matters of fact, and, accordingly, we do not express any opinion as to matters that might have been disclosed by independent verification.

Mohawk Industries, Inc.

Mohawk Capital Finance S.A.

May 18, 2018

Page 3

For purposes of this opinion letter, we have assumed (i) the genuineness of the signatures on all documents reviewed by us; (ii) the authenticity of all documents submitted to us as originals; (iii) the conformity to the originals of all documents submitted to us as certified, conformed, photostatic, electronic or telefacsimile copies; (iv) the legal capacity of all natural persons executing the Transaction Documents; and (v) the due authorization, execution, and delivery of and the validity and binding effect of each of the Transaction Documents with regard to the parties to the Transaction Documents other than the Company and the Parent Guarantor.

We express no opinion herein in respect of any laws other than the General Corporation Law of the State of Delaware and the laws of the State of New York which, in our experience, are normally applicable to transactions of the type contemplated by the Transaction Documents. For purposes of our opinion that the Notes constitute valid and binding obligations of the Company, we have relied, without conducting any research or investigation with respect thereto, solely on the opinion of Arendt & Medernach S.A., dated the date hereof and filed herewith, that the Notes have been authorized and approved for issuance and have been duly executed under the laws of Luxembourg. We are not licensed to practice in Luxembourg, and we have made no investigation of, and do not express or imply an opinion on, the laws of Luxembourg.

Based upon the foregoing, it is our opinion that the Guarantee has been duly authorized by the Parent Guarantor for issuance and sale pursuant to the Underwriting Agreement and the Indenture and has been duly executed by the Parent Guarantor, and assuming due authorization, execution, issuance and delivery of the Notes by the Company under the laws of Luxembourg and due authentication of the Notes by the Trustee, the Notes and the Guarantee constitute valid and legally binding obligations of the Company and the Parent Guarantor, respectively, enforceable in accordance with their terms and entitled to the benefits of the Indenture.

Insofar as the foregoing opinion relates to the legality, validity, binding effect or enforceability of any agreement or obligation of the Company or the Parent Guarantor, such opinions are subject to the effects of (i) bankruptcy, fraudulent conveyance or fraudulent transfer, insolvency, reorganization, moratorium, liquidation, conservatorship, and similar laws, and limitations imposed under judicial decisions, related to or affecting creditors’ rights and remedies generally, (ii) general equitable principles, regardless of whether the issue of enforceability is considered in a proceeding in equity or at law, and principles limiting the availability of the remedy of specific performance, (iii) concepts of good faith, fair dealing, materiality and reasonableness, and (iv) the possible unenforceability under certain circumstances of provisions providing for exculpation, indemnification and contribution that are contrary to public policy.

The opinion contained herein is limited to the matters expressly stated herein, and no opinion may be implied or inferred beyond the opinion expressly stated.

The foregoing opinion is rendered as of the date hereof, and we make no undertaking and expressly disclaim any duty to supplement or update such opinion if, after the date hereof, facts or circumstances come to our attention or changes in the law occur which could affect such opinion.

Mohawk Industries, Inc.

Mohawk Capital Finance S.A.

May 18, 2018

Page 4

We hereby consent to the filing of this opinion letter with the Commission as an exhibit to the Parent Guarantor’s Current Report on Form 8-K being filed on the date hereof and incorporated by reference into the Parent Guarantor’s and the Company’s Registration Statement on Form S-3, as amended (Nos. 333-219716 and 333-219716-02) related to the Securities, including information deemed to be a part thereof pursuant to Rule 430B of the Commission (the “Registration Statement”). We also hereby consent to the reference to our firm under the caption “Legal Matters” in the Registration Statement and in the prospectus supplement related to the offer and sale of the Securities and forming a part of the Registration Statement. In giving this consent, we do not thereby admit that we are included in the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Commission thereunder.