Rosemary Monica Wanjiru is a Kenyan professional female long-distance runner. She won the silver medal in the 5000 metres at the 2015 African Games, and represented her country at the 2019 World Athletics Championships, finishing fourth in the 10,000 metres. Wanjiru won the 2023 Tokyo Marathon and placed second at the 2022 Berlin Marathon. With her Tokyo mark, she sits sixth on the marathon world all-time list.