The Office of Inspector General is tasked with ensuring efficiency, accountability, and integrity in the U.S. Postal Service. We also have the distinct mission of helping to maintain confidence in the mail and postal system, as well as to improve the Postal Service’s bottom line. We use audits and investigations to help protect the integrity of the Postal Service. Our Semiannual Report to Congress presents a snapshot of the work we did to fulfill our mission for the six-month period ending March 31, 2021. Our dynamic report format provides readers with easy access to facts and information, as well as succinct summaries of the work by area. Links are provided to the full reports featured in this report, as well as to the appendices.