| Personal information | |
|---|---|
| Full name | Martti Sakari Järventaus |
| Nickname(s) | "Mara" |
| Nationality | Finland |
| Born | December 16, 1960 Kotka, Finland |
| Height | 1.84 m (6 ft 0 in) |
| Weight | 72 kilograms (160 lb) |
| Sport | |
| Sport | Swimming |
| Stroke(s) | Breaststroke |
| Club | Lappeenrannan Uimarit |
Martti Järventaus (born December 16, 1960 in Kotka, Finland) is a retired male breaststroke swimmer from Finland. He twice competed for his native country at the Summer Olympics: in 1980 and 1984.