It’s in this spirit that we joined legacy PolyOne and the Clariant Color business, two complementary businesses, and formed a new one that we’ve named Avient. We are better together through: Keeping Safety First — PolyOne and Clariant are both ACC Responsible Care® companies, and nothing is more important than the health, safety and well-being of our people. Leading in Sustainability — PolyOne and Clariant are both founding members of the Alliance to End Plastic Waste, and we are committed to meeting the needs of the present without compromising the ability of future generations to do the same.

Avient was formed as PolyOne Corporation on August 31, 2000 from the consolidation of The Geon Company (Geon) and M.A. Wulfsohn 73 AVIENT CORPORATION Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the following Registration Statements: (1) Registration Statement (Form S-8 No. 333-238246) pertaining to the PolyOne Corporation 2020 Equity and Incentive Compensation Plan; (2) Registration Statement (Form S-8 No. 333-231236) pertaining to the PolyOne Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014); (3) Registration Statement (Form S-8 No. 333-217879) pertaining to the PolyOne Corporation 2017 Equity and Incentive Compensation Plan; (4) Registration Statement (Form S-8 No. 333-205919) pertaining to the Amended and Restated PolyOne Corporation 2010 Equity and Performance Incentive Plan; (5) Registration Statement (Form S-8 No. 333-181787) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; (6) Registration Statement (Form S-8 No. 333-166775) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; (7) Registration Statement (Form S-8 No. 333-157486) pertaining to the PolyOne Retirement Savings Plan; (8) Registration Statement (Form S-8 No. 333-47796) pertaining to Post-Effective Amendment No. 3 on Form S-8 to Form S-4 pertaining to the Geon Company 1993 Incentive Stock Plan, the Geon Company 1995 Incentive Stock Plan, the Geon Company 1998 Interim Stock Award Plan, the Geon Company 1999 Incentive Stock Plan, the PolyOne Corporation Deferred Compensation Plan for Non-Employee Directors and the M.A. Hanna Company Long-Term Incentive Plan; (9) Registration Statement (Form S-8 No. 333-141029) pertaining to the PolyOne Retirement Savings Plan and the DH Compounding Company Savings and Retirement Plan and Trust; and (10) Registration Statement (Form S-3 No. 333-236116) of PolyOne Corporation of our reports dated February 22, 2022, with respect to the consolidated financial statements of Avient Corporation and the effectiveness of internal control over financial reporting of Avient Corporation, included in this Annual Report (Form 10-K) of Avient Corporation for the year ended December 31, 2021.

PolyOne DB4998 RED 4135 NON-PHTHALATE

POLYONE V1840H WIRE FLUID BED PVC

Annex 2 – ISO 22000 certifications Avient Colorants Spain S.A, Avient Colorants Santa Clara Coatitla Mexico, and PolyOne Spain SLU have enhanced systems to support food packaging applications with an external ISO 22000 certification adding the following core processes: Change All changes concerning any product produced under ISO 22000 conditions are evaluated to determine whether there will be any impact the Supplier approval and supplier evaluation specification or in the quality of the product. . HACCP Avient Colorants Spain S.A., Avient Colorants Toluca Mexico, and PolyOne Spain SLU follow the structure of HACCP (Hazard Analysis and Critical Control Point) as a system for assessing compliance to food safety standards.

Örnek: PolyOne Canada, Inc'teki bir pozisyona baİvuruyorsunuz. ABD'deki sorumlu departmanın (Avient Corporation) ve standart olarak Kanada'daki (PolyOne Canada, Inc.)

Avient was formed as PolyOne Corporation on August 31, 2000 from the consolidation of The Geon Company (Geon) and M.A. Wulfsohn 72 AVIENT CORPORATION Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in the following Registration Statements: 1) Registration Statement (Form S-8 No. 333-238246) pertaining to the PolyOne Corporation 2020 Equity and Incentive Compensation Plan; 2) Registration Statement (Form S-8 No. 333-231236) pertaining to the PolyOne Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014); 3) Registration Statement (Form S-8 No. 333-217879) pertaining to the PolyOne Corporation 2017 Equity and Incentive Compensation Plan; 4) Registration Statement (Form S-8 No. 333-205919) pertaining to the Amended and Restated PolyOne Corporation 2010 Equity and Performance Incentive Plan; 5) Registration Statement (Form S-8 No. 333-181787) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; 6) Registration Statement (Form S-8 No. 333-166775) pertaining to the PolyOne Corporation 2010 Equity and Performance Incentive Plan; 7) Registration Statement (Form S-8 No. 333-157486) pertaining to the PolyOne Retirement Savings Plan; 8) Registration Statement (Form S-8 No. 333-47796) pertaining to Post-Effective Amendment No. 3 on Form S-8 to Form S-4 pertaining to the Geon Company 1993 Incentive Stock Plan, the Geon Company 1995 Incentive Stock Plan, the Geon Company 1998 Interim Stock Award Plan, the Geon Company 1999 Incentive Stock Plan, the PolyOne Corporation Deferred Compensation Plan for Non-Employee Directors and the M.A. THIS PAGE IS NOT PART OF AVIENT’S FORM 10-K FILING Comparison of Cumulative Total Return to Shareholders THIS PAGE IS NOT PART OF POLYONE’S FORM 10-K FILINGTHIS PAGE IS NOT PART OF POLYONE’S FORM 10-K FILINGTHIS PAGE IS NOT PART OF AVIENT’S FORM 10-K FILING Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

Para obter mais informações sobre como a Avient processa suas informações pessoais para esses serviços e sites de terceiros, visite a Declaração de Privacidade da Avient Corporation, disponível em https://www.avient.com/company/policies-and-governance/polyone-corporation-privacy-statement. Exemplo: você está candidatando-se a um cargo na PolyOne Canada, Inc. Os membros do departamento responsável nos EUA (Avient Corporation) e – como norma – o departamento de RH no Canadá (PolyOne Canada, Inc.) estão envolvidos no tratamento da sua candidatura.

Aby uzyskaą wiącej informacji na temat sposobu, w jaki Avient przetwarza dane osobowe Kandydatów w ramach ąwiadczenia tych usług oraz na temat witryn internetowych stron trzecich, prosimy zapoznaą sią z Oąwiadczeniem Avient Corporation o ochronie prywatnoąci dostąpnym pod adresem https://www.avient.com/company/policies-and- governance/polyone-corporation-privacy-statement). Przykładowo: Kandydat ubiega sią o stanowisko w PolyOne Canada, Inc. W rozpatrywanie podania zaangaąowani są członkowie odpowiedzialnego działu w USA (Avient Corporation) oraz – standardowo – działu HR w Kanadzie (PolyOne Canada, Inc.).

Avient was formed as PolyOne Corporation on August 31, 2000 from the consolidation of The Geon Company (Geon) and M.A. Bank Trust Company, National Association as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed on August 10, 2022, SEC File No. 1-16091) 4.3 Description of Securities (incorporated by reference to Exhibit 4.2 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019, SEC File No. 1-16091). 10.1 Third Amended and Restated Credit Agreement, dated June 28, 2019, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Wells Fargo Capital Finance, LLC, as administrative agent, and the various lenders and other agents party thereto (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2019, SEC File No. 1-16091) 10.2 First Amendment to Third Amended and Restated Credit Agreement, dated as of October 26, 2021, by and among the lenders party thereto, Wells Fargo Capital Finance, LLC, as administrative agent for the lenders, Avient Corporation, NEU Specialty Engineered Materials, LLC, Avient Canada ULC, and PolyOne S.à.r.l. THIS PAGE IS NOT PART OF AVIENT’S FORM 10-K FILING THIS PAGE IS NOT PART OF POLYONE’S FORM 10-K FILINGTHIS PAGE IS NOT PART OF POLYONE’S FORM 10-K FILINGTHIS PAGE IS NOT PART OF AVIENT’S FORM 10-K FILING CORPORATE OFFICERS ASHISH K.