Onyinyechi Mark (born 5 July 2001) is a Nigerian powerlifter who competes in the 61 kilograms (134 lb) bracket.

Onyinyechi Mark was born in Umuahia, Abia State on 5 July 2001.

[1][2] In 2021, Mark won the silver medal in her event at the 2021 World Para Powerlifting Championships held in Tbilisi, Georgia, finishing behind Amalia Pérez.

[3][4] She made her debut at the in 2022 Commonwealth Games in the women's lightweight event, where Mark and compatriot Latifat Tijani were disqualified.

[5][6] In 2023, Mark won the gold medal in her event at the 2023 World Para Powerlifting Championships held in Dubai, United Arab Emirates.