Mildred Muis is a swimmer who has competed for the Netherlands. She competed at the 1988 and 1992 Summer Olympic Games.
Muis arrived at her first Olympics in 1988 with her twin sister Marianne as members of the Dutch swimming team. There, she helped the Dutch women of Conny van Bentum, Karin Brienesse, and Marianne secure a runner-up spot behind their East German rivals in the 4x100 metres freestyle relay. The Muis twins returned to their second Games four years later in Barcelona with Diana van der Plaats and Inge de Bruijn. She and her teammates failed to reproduce a similar outcome from Seoul in the 4x100 metres freestyle relay, slipping off the podium to fifth.
Olympic Results[]
| Year | Event | Rank |
|---|---|---|
| 1988 | Women's 200m individual medley | 9th |
| Women's 400m individual medley | 21st | |
| Women's 4x100m freestyle relay | 
| |
| 1992 | Women's 100m freestyle | 13th |
| Women's 200m individual medley | 19th | |
| Women's 4x100m freestyle relay | 5th |
1988[]
| Discipline | Round | Time | |
|---|---|---|---|
| 200 metres individual medley | Heats | 2:19.46 | |
| B Final | 2:17.73 | ||
| 400 metres individual medley | Heats | 4:56.89 | |
| Final | Did not advance | ||
| 4x100 metres freestyle relay | Heats | 3:44.12 (55.85 split) |
|
| Final | 3:43.39 (56.36 split) |
NR | |
1992[]
| Discipline | Round | Time |
|---|---|---|
| 100 metres freestyle | Heats | 56.67 |
| B Final | 56.64 | |
| 200 metres individual medley | Heats | 2:19.10 |
| Final | Did not advance | |
| 4x100 metres freestyle relay | Heats | 3:44.00 (56.71 split) |
| Final | 3:43.74 (55.75 split) |