Debby Haak (born 25 February 1977) is a former tennis player from the Netherlands. She turned professional at the age of 18.

She made her WTA Tour main-draw debut at the 2000 Heineken Trophy after she received a wild card into the doubles draw. In her career, she won 17 ITF doubles titles and achieved a highest doubles ranking of 154 in the world.

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	4 August 1996	Catania, Italy	Clay	Giulia Casoni	6–4, 3–6, 4–6
Loss	2.	18 August 1996	Nicolosi, Italy	Clay	Lucie Steflová	6–7, 2–6

Result	No.	Date	Tournament	Surface	Partner	Opponents	Score
Win	1.	12 June 1995	Bossonnens, Switzerland	Clay	Patty Van Acker	Stephanie Gomperts Henriëtte van Aalderen	6–7, 6–3, 7–5
Loss	2.	9 October 1995	Burgdorf, Switzerland	Carpet (i)	Martine Vosseberg	Jana Macurová Olga Vymetálková	1–6, 3–6
Loss	3.	16 October 1995	Langenthal, Switzerland	Carpet (i)	Kristin Osmond	Jana Macurová Olga Vymetálková	7–5, 4–6, 3–6
Win	4.	23 June 1996	Klosters, Switzerland	Clay	Patty Van Acker	Silke Frankl Ursula Svetlik	6–3, 7–6
Win	5.	24 June 1996	Velp, Netherlands	Clay	Marielle Bruens	Nelly Barkan Martine Vosseberg	3–6, 6–4, 6–2
Win	6.	7 July 1996	Heerhugowaard, Netherlands	Clay	Marielle Bruens	Sabine Gerke Anna Klim	1–6, 6–0, 6–2
Loss	7	14 July 1996	Amersfoort, Netherlands	Clay	Marielle Bruens	Tomoe Hotta Sandra Olsen	3–6, 4–6
Loss	8.	5 August 1996	Catania, Italy	Clay	Franke Joosten	Tathiana Garbin Francesca Guardigli	2–6, 5–7
Loss	9.	15 September 1996	Marseille, France	Clay	Alice Canepa	Sofie Albinus Karin Ptaszek	7–5, 5–7, 4–6
Loss	10.	24 November 1996	Ismailia, Egypt	Clay	Shiri Burstein	Teodora Nedeva Katarina Srebotnik	4–6, 4–6
Win	11.	13 July 1997	Amersfoort, Netherlands	Clay	Eva Bes	Anna Klim Zuzana Lešenarová	4–3 ret.
Loss	12.	7 September 1997	Bad Nauheim, Germany	Clay	Maaike Koutstaal	Annica Lindstedt Luciana Masante	2–6, 2–6
Loss	13.	19 April 1998	Galatina, Italy	Clay	Silvia Uríčková	Rosa María Andrés Rodríguez Noelia Serra	4–6, 1–6
Win	14.	10 May 1998	Elvas, Portugal	Hard	Rosa María Andrés Rodríguez	Marina Escobar Paula Hermida	w/o
Loss	15.	19 July 1998	Civitanova, Italy	Clay	Giana Gutiérrez	Magdalena Zděnovcová Jana Lubasová	3–6, 4–6
Win	16.	20 September 1998	Constanța, Romania	Clay	Jolanda Mens	Nino Louarsabishvili Alice Pirsu	6–3, 7–6
Loss	17.	7 November 1998	Moulins, France	Hard (i)	Andrea van den Hurk	Diane Asensio Iroda Tulyaganova	5–7, 6–2, 2–6
Loss	18.	28 February 1999	Faro, Portugal	Hard (i)	Marina Escobar	Gabriela Chmelinová Olga Vymetálková	2–6, 6–3, 4–6
Loss	19.	25 April 1999	Bari, Italy	Clay	Giana Gutiérrez	Lotty Seelen Susanne Trik	4–6, 3–6
Loss	20.	13 June 1999	Biel, Switzerland	Clay	Andrea van den Hurk	Mireille Dittmann Natalie Dittmann	5–7, 6–1, 1–6
Win	21.	21 June 1999	Alkmaar, Netherlands	Clay	Stefanie Haidner	Jolanda Mens Anouk Sterk	6–4, 1–6, 6–3
Win	22.	5 July 1999	Amersfoort, Netherlands	Clay	Natasha Galouza	Stefanie Haidner Adrienn Hegedűs	7–6(7–2), 6–4
Win	23.	25 July 1999	Valladolid, Spain	Hard	Andrea van den Hurk	Lenka Cenková Meike Fröhlich	2–6, 6–3, 7–6
Win	24.	5 September 1999	Spoleto, Italy	Clay	Andrea van den Hurk	Clarisa Fernández Francesca Schiavone	6–1, 6–1
Win	25.	30 August 1999	Fano, Italy	Clay	Andrea van den Hurk	Katalin Marosi Alicia Ortuño	6–1, 6–4
Win	26.	19 September 1999	Reggio Calabria, Italy	Clay	Andrea van den Hurk	Alice Canepa Tathiana Garbin	6–1, 6–1
Win	27.	31 January 2000	Mallorca, Spain	Clay	Stefanie Haidner	Aurélie Védy Maria Wolfbrandt	6–4, 3–6, 6–4
Win	28.	22 April 2000	San Severo, Italy	Clay	Lotty Seelen	Oana-Elena Golimbioschi Svetlana Krivencheva	6–4, 6–3
Loss	29.	4 March 2001	Bendigo, Australia	Hard	Jolanda Mens	Leanne Baker Shelley Stephens	3–6, 2–6
Loss	30.	18 March 2001	Benalla, Australia	Grass	Jolanda Mens	Monique Adamczak Samantha Stosur	3–6, 5–7
Win	31.	1 April 2001	Benalla, Australia	Grass	Jolanda Mens	Beti Sekulovski Nicole Sewell	6–4, 6–3
Loss	32.	17 June 2001	Raalte, Netherlands	Clay	Jolanda Mens	Milica Koprivica Anouk Sterk	2–6, 7–5, 6–7(2–7)
Loss	33.	1 July 2001	Alkmaar, Netherlands	Clay	Jolanda Mens	Susanne Trik Anouk Sterk	4–6, 4–6
Loss	34.	26 August 2001	Enschede, Netherlands	Clay	Jolanda Mens	Natalia Galouza Lotty Seelen	0–6, 6–2, 5–7
Loss	35.	9 September 2001	Denain, France	Clay	Jolanda Mens	Émilie Loit Irina Selyutina	1–6, 3–6
Loss	36.	30 June 2002	Rabat, Morocco	Clay	Jolanda Mens	Gulnara Fattakhetdinova Maria Kondratieva	3–6, 5–7
Loss	37.	19 August 2002	Enschede, Netherlands	Clay	Daniela Klemenschits	Daniela Kix Annette Kolb	1–6, 5–7
Loss	38.	8 December 2002	Nonthaburi, Thailand	Hard	Amanda Augustus	Ivana Abramović Remi Tezuka	2–6, 1–6
Win	39.	2 February 2003	Rockford, Illinois, United States	Hard (i)	Seda Noorlander	Michaela Paštiková Valentina Sassi	7–5, 6–4

Outcome	No.	Date	Tournament	Surface	Partner	Opponents	Score
NP	—	12 July 1998	Amersfoort, Netherlands	Clay	Giana Gutiérrez	Yvette Basting Henriëtte van Aalderen	NP

• Debby Haak at the Women's Tennis Association
• Debby Haak at the International Tennis Federation