Marja-Liisa Olthuis (née Mujo, born August 9, 1967 in , Inari, Finland) is an Inari Sámi linguist, academic, translator, and writer, who currently lives in the Netherlands with her Dutch husband and children. She received the Israel Ruong Scholarship from the in 1999. On April 14, 2007, she became the first Inari Sámi to successfully defended a doctoral thesis about the Inari Sámi language in Inari Sámi. On 21 February 2020 she was awarded the Linguapax Prize.