Western Asset Municipal Defined Opportunity Trust N-CSR Certified annual shareholder report (management investment company)

CERTIFICATIONS PURSUANT TO SECTION 906

EX-99.906CERT

CERTIFICATION

Jane Trust, Chief Executive Officer, andRichard F. Sennett,Principal Financial Officer of Western Asset Municipal Defined Opportunity Trust Inc. (the “Registrant”), each certify to the best of their knowledge that:

1. The Registrant’s periodic report on FormN-CSR for the period ended November 30, 2018 (the “FormN-CSR”) fully complies with the requirements of section 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the FormN-CSR fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Chief Executive Officer	Principal Financial Officer
Western Asset Municipal Defined Opportunity Trust Inc.	Western Asset Municipal Defined Opportunity Trust Inc.
/s/ Jane Trust	/s/ Richard F. Sennett
Jane Trust	Richard F. Sennett
Date: January 25, 2019	Date: January 25, 2019

This certification is being furnished to the Securities and Exchange Commission solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the FormN-CSR with the Commission.