Monica Afia Twum (born 14 March 1978) is a female track and field sprinter from Ghana. Together with Mavis Akoto, Vida Anim and Vida Nsiah she holds the Ghanaian record in 4 x 100 metres relay with 43.19 seconds, achieved during the heats at the 2000 Summer Olympics in Sydney.
| Representing | ||||||
|---|---|---|---|---|---|---|
| 1997 | Ibadan, Nigeria | bgcolor=silver | 2nd | 100 m | 12.42 | |
| bgcolor=silver | 2nd | 200 m | 24.28 | |||
| 3rd | 400 m | 54.35 | ||||
| 1998 | Kuala Lumpur, Malaysia | 15th (h) | 100 m | 11.72 | ||
| 8th | 200 m | 23.73 | ||||
| 4th | 4 × 100 m relay | 43.81 | ||||
| 1999 | Seville, Spain | 40th (h) | 100 m | 11.70 | ||
| Johannesburg, South Africa | 7th | 100 m | 11.48 | |||
| 3rd | 200 m | 22.98 | ||||
| 3rd | 4 × 100 m relay | 44.21 | ||||
| 2000 | Algiers, Algeria | 3rd | 100 m | 11.47 | ||
| bgcolor=gold | 1st | 4 × 100 m relay | 43.99 | |||
| Sydney, Australia | 31st (qf) | 100 m | 11.70 | |||
| 35th (h) | 200 m | 23.51 | ||||
| 9th (sf) | 4 × 100 m relay | 43.19 | ||||