Masaki Ejima (江島 雅紀, Ejima Masaki, born 6 March 1999) is a Japanese athlete specialising in the pole vault. He represented his country at the 2019 World Championships in Doha without qualifying for the final. In 2018 he won a bronze medal at the World U20 Championships in Tampere. His personal bests in the event are 5.71 metres outdoors (Kisarazu 2019) and 5.50 metres indoors (Pajulahti 2017).