Petra Kamstra (born 18 March 1974) is a former professional tennis player from the Netherlands who won one WTA Tour-title in doubles during her career. She reached her individual career-high singles ranking on 2 October 1995, when Kamstra became the No. 70 of the world. Twice she was named the Rotterdam Sportswoman of the Year (1990 and 1992).

Outcome	Date	Tournament	Surface	Partner	Opponents	Score
Winner	8 October 1995	Surabaya, Indonesia	Hard	Tina Križan	Nana Miyagi Stephanie Reece	2–6, 6–4, 6–1

Result	No.	Date	Tournament	Surface	Opponent	Score
Win	1.	17 July 1989	Koksijde, Belgium	Clay	Heleen van den Berg	7–5, 7–5
Loss	2.	15 October 1990	Madeira, Portugal	Hard	Sabine Gerke	1–6, 1–6
Win	3.	22 October 1990	Benin City, Nigeria	Hard	Sarah Bentley	6–0, 7–5
Loss	4.	24 May 1993	Brindisi, Italy	Clay	Irina Spîrlea	1–6, 7–5, 3–6
Loss	5.	7 June 1993	Le Havre, France	Clay	Ludmila Richterová	7–6, 3–6, 4–6
Loss	6.	14 August 1995	Carthage, Tunisia	Clay	María Fernanda Landa	2–3 ret.

Result	No.	Date	Tournament	Surface	Partner	Opponent	Score
Loss	1.	15 October 1990	Madeira, Portugal	Hard	Monica Mraz	Cora Linneman Stephanie Mayorkis	4–6, 5–7
Win	2.	25 May 1992	Ashkelon, Israel	Hard	Ilana Berger	Michelle Anderson Limor Zaltz	6–2, 2–6, 6–4
Win	3.	24 May 1993	Brindisi, Italy	Clay	Lara Bitter	Angela Kerek Irina Spîrlea	7–5, 4–6, 6–2
Loss	4.	12 July 1993	Vigo, Spain	Hard	Linda Niemantsverdriet	María Fernanda Landa Sofia Prazeres	6–7, 6–3, 6–7

• Petra Kamstra at the Women's Tennis Association
• Petra Kamstra at the International Tennis Federation