Lauren van Oosten (born November 17, 1978) is a Canadian competition swimmer and a breaststroke specialist.

There she came from sixth place to third in the final 50 metres of the 200 m breaststroke race to win a bronze medal.

She qualified and raced at the 2003 World Aquatics Championships in Barcelona, Spain, where she swam in the 100 and 200-metre breaststroke events.

Then in November 2003, at Canadian Open in Quebec, van Oosten broke a 10-year-old national record in the women's 200-metre breaststroke to highlight the third day of competition, with a time of 2:25.47.

Following that she broke her Canadian record, only two months later, at the World Cup swimming competitions in East Meadow, New York.

She did just that with a gold medal win in the 100-metre breaststroke, qualifying her for the 2006 Commonwealth Games in Melbourne, Australia.