Tonny de Jong (born 17 July 1974) is a former Dutch speed skater, who was raised in Heerenveen and now lives in Calgary with Canadian speed skater Mark Knoll, whom she married in 2003.

[2] De Jong was the first skater who mastered the clap skate.

[3] At the 2002 Winter Olympics she had little success, but she did appear in a nude pictorial in the March issue of the Dutch Playboy.

[4] After the following World Allround Championships she ended her speedskating career.

An overview of medals won by de Jong at important championships she participated in, listing the years in which she won each: To put these personal records in perspective, the last column (WR) lists the official world records on the dates that de Jong skated her personal records.