| Masaki Ejima | |
| Birth Date: | 6 March 1999 |
| Birth Place: | Kanagawa Prefecture, Japan[1] |
| Height: | 1.90 m |
| Weight: | 79 kg |
| Sport: | Athletics |
| Event: | Pole vault |
| Education: | Nihon University[2] |
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).
| Representing | |||||
|---|---|---|---|---|---|
| 2015 | World Youth Championships | Cali, Colombia | 6th | 5.00 m | |
| 2016 | World U20 Championships | Bydgoszcz, Poland | 6th | 5.35 m | |
| 2017 | Asian Championships | Bhubaneswar, India | bgcolor=silver | 2nd | 5.65 m |
| Universiade | Taipei, Taiwan | 4th | 5.40 m | ||
| 2018 | World U20 Championships | Tampere, Finland | 3rd | 5.55 m | |
| 2019 | Asian Championships | Doha, Qatar | 6th | 5.51 m | |
| Universiade | Naples, Italy | 7th | 5.21 m | ||
| World Championships | Doha, Qatar | 28th (q) | 5.45 m | ||
| 2021 | Olympic Games | Tokyo, Japan | 25th (q) | 5.30 m | |