| Seika Aoyama | |
| Birth Date: | 1 May 1996 |
| Birth Place: | Matsue, Shimane Prefecture, Japan |
| Height: | 1.71 m[1] |
| Weight: | 56 kg |
| Sport: | Athletics |
| Event: | 100–400 m |
| Show-Medals: | yes |
is a Japanese sprinter specialising in the 400 metres.[2] She competed in the 4 × 400 metres relay at the 2015 World Championships in Beijing and earlier won a silver medal in this event at the 2014 Asian Games.
| Representing | |||||
|---|---|---|---|---|---|
| 2013 | World Youth Championships | Donetsk, Ukraine | 9th (sf) | 200 m | 24.01 |
| 3rd | Medley relay | 2:07.61 | |||
| 2014 | Asian Games | Incheon, South Korea | 5th | 400 m | 53.20 |
| bgcolor=silver | 2nd | 4 × 400 m relay | 3:30.80 | ||
| 2015 | World Relays | Nassau, Bahamas | 2nd (B) | 4 × 400 m relay | 3:34.65 |
| World Championships | Beijing, China | 13th (h) | 4 × 400 m relay | 3:28.91 | |
| 2017 | Asian Championships | Bhubaneswar, India | 7th | 400 m | 55.63 |
| 6th | 4 × 100 m relay | 45.40 | |||
| 3rd | 4 × 400 m relay | 3:37.74 | |||
| 2019 | Asian Championships | Doha, Qatar | 3rd | 4 × 400 m relay | 3:34.88 |
| World Relays | Yokohama, Japan | 7th (B) | 4 × 400 m relay | 3:35.12 | |