Western Asset Mortgage Opportunity Fund Inc. is a US-based closed-end fixed income mutual fund managed by Legg Mason Partners Fund Advisor, LLC, and co-managed by Western Asset Management Company and Western Asset Management Company Limited. It invests primarily in mortgage-backed securities and uses in-depth research to create its portfolio. The fund benchmarks its performance against the BofA Merrill Lynch U.S. Floating Rate Home Equity Loan Asset Backed Securities Index.