Ilse Kristiina " Tiina" Lillak (born 15 April 1961) is a Finland former . She is the 1983 world champion and 1984 Olympic silver medalist. She also twice broke the world record, with throws of 72.40 metres in 1982 and 74.76 metres in 1983. The latter distance ranks third on the all-time list with the old javelin model.
At the 1983 World Championships in Athletics held in Helsinki, Lillak became the champion in front of her home crowd when she threw for 70.82 meters on her last attempt leaving Britain's second placed Fatima Whitbread in tears at track side as she went running off down the track celebrating with the ecstatic crowd. The whole season was a success for Lillak, who threw over 70 meters in 16 separate competitions and .
Although Lillak had only taken part in three competitions earlier in the year, she still managed to earn an Olympic Games silver medal at the 1984 Summer Olympics in Los Angeles, California. Medals did not materialise at the 1986 European Athletics Championships (fourth) or the 1987 World Championships in Athletics (sixth).
She failed in an attempt to reach the Olympic podium a second time at the 1988 Seoul Olympics, where Lillak did not pass the qualifying round. She participated in five competitions in 1989, but no major events. In 1990 she won the last of her seven Finnish national championships and came tenth in the 1990 European Athletics Championships. In the 1991 World Championships in Athletics, Lillak did not pass the qualifying round (in fact, she did not throw over 62 meters the entire season).
Since retiring from athletics in 1992, Lillak has been working as massage.
| 1980 | Olympic Games | Moscow, Soviet Union | 14th (q) | 56.26 m |
| 1982 | European Championships | Athens, Greece | 4th | 66.26 m |
| 1983 | World Championships | Helsinki, Finland | 1st | 70.82 m |
| 1984 | Olympic Games | Los Angeles, United States | 2nd | 69.00 m |
| 1986 | European Championships | Stuttgart, Germany | 4th | 66.66 m |
| 1987 | World Championships | Rome, Italy | 6th | 66.82 m |
| 1988 | Olympic Games | Seoul, South Korea | 15th (q) | 60.06 m |
| 1990 | European Championships | Split, Yugoslavia | 10th | 58.80 m |
| 1991 | World Championships | Tokyo, Japan | 15th (q) | 58.42 m |
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