Marietta Brew Appiah-Oppong (an haife ta a Tema), 'yar Ghana ce mai aikin shari'a kuma tsohuwar babban lauyan Ghana kuma ministar shari'a ta Ghana. Shugaba Mahama ne ya nada ta a shekarar 2013. Ita ce mace ta biyu da ke rike da wannan mukami a kasar, ta farko ita ce Mrs. Betty Mould-Iddrisu. Zamanta a matsayin babban mai shigar da kara na Ghana ya kare ne a ranar 6 ga watan Janairun 2017. An nada ta a matsayin kotun sasantawa ta kungiyar 'yan kasuwa ta duniya daga ranar 1 ga Yulin 2018 na tsawon shekaru uku. Ita memba ce Majalisar Daraja ta Gana Association of Restructuring and Insolvency Advisors (GARIA). Marietta ta fara karatun ta a Makarantar Iyaye ta Tema. Ta yi karatun sakandire a St Roses Senior High (Akwatia) inda ta yi karatun ta na yau da kullun (O level) da Advanced Level Certificate (A level). Daga nan ta samu digirin ta na digiri na uku (LLB) daga Jami’ar Ghana da ke Legon da kuma takardar shaidar sana’arta ta aikin lauya daga Makarantar Koyon Aikin Shari’a ta Ghana, (Makola).