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 uzyskać więcej informacji na temat sposobu, w jaki Avient przetwarza dane osobowe Kandydatów w ramach świadczenia tych usług oraz na temat witryn internetowych stron trzecich, prosimy zapoznać się z Oświadczeniem Avient Corporation o ochronie prywatności dostępnym pod adresem https://www.avient.com/company/policies-and- governance/polyone-corporation-privacy-statement). Przykładowo: Kandydat ubiega się o stanowisko w PolyOne Canada, Inc. W rozpatrywanie podania zaangażowani 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.

Example: You are applying for a position at PolyOne Canada, Inc. Members of the responsible department in the USA (Avient Corporation) and – as a standard – the HR department in Canada (PolyOne Canada, Inc.) are involved in handling your application.

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.

ベース樹脂 誘電率（Dk） ET7600- 8031 ET7600- 8027 ET7600- 8025 ET7600- 8037 ET7600- 8019 ET7600- 8028 ET7600- 8026 ET7600- 8044 ET7600- 8029 ET7600- 8041 ET7600- 8045 ET7600- 8036 PPE PPE PPE PPE PPE PPE PPE PPE PPE PPE PPE PPE 3.0 3.1 3.35 3.6 3.8 4.4 4.8 5.28 5.4 5.85 7.0 9.0 EDGETEK TM EDGETEK TM Avient のカスタマイズされた材料設計は、5G基地局のアンテナの進化にどのような優位性をもたらすか 素早い仕様決定と、短いリードタイム - PolyOne は１ 週間以内で指定されたDk値でサンプルを試作し、2～3 週間以内に工場スケールで製品をお届けします。