Western Asset Mortgage Defined Opportunity Fund Inc. ("DMO") Announces Distributions for the Month of December 2018

Western Asset Mortgage Defined Opportunity Fund Inc. DMO announced today a distribution from short-term capital gains of $0.2214 per common share, a distribution from long-term capital gains of $0.4841 per common share and a distribution from income of $0.7752 per common share for December 2018. These distributions are in addition to the previously declared income distribution of $0.1750 per common share payable December 31, 2018 to shareholders of record as of December 21, 2018.

The distribution schedule appears below:

This press release is not for tax reporting purposes but is being provided to announce the amount of each Fund's distributions that have been declared by the Board of Directors. In early 2019, after definitive information is available, each Fund will send shareholders a Form 1099-DIV, if applicable, specifying how the distributions paid by each Fund during the prior calendar year should be characterized for purposes of reporting the distributions on a shareholder's tax return (e.g., ordinary income, long-term capital gain or return of capital).

Western Asset Mortgage Defined Opportunity Fund Inc., a non-diversified, limited-term, closed-end management investment company, is managed by Legg Mason Partners Fund Advisor, LLC, a wholly-owned subsidiary of Legg Mason, Inc. and is sub-advised by Western Asset Management Company, an affiliate of the investment manager.

For more information about the Funds, please call 1-888-777-0102 or consult the Fund's web site at www.lmcef.com. Hard copies of the Funds' complete audited financial statement are available free of charge upon request.

Data and commentary provided in this press release are for informational purposes only. Legg Mason and its affiliates do not engage in selling shares of the Fund.

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