Stefanie Haidner (born 18 November 1977) is a retired Austrian tennis player.

In her career, she won 18 doubles titles on the ITF Women's Circuit. Her career-high WTA singles ranking is 232, which she reached on 23 February 2004. On 19 July 2004, she peaked at No. 165 in the doubles rankings.

Haidner made her WTA Tour debut at the 2003 Linz Open, partnering Adriana Jerabek in doubles, but lost her quarterfinals match against fellow Marion Bartoli and Silvia Farina Elia. And at 2008 Gastein Ladies, partnering Hülya Esen in doubles, they lost in the first round.

Haidner retired from the professional tour 2015.

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	14 September 1998	Reggio Calabria, Italy	Clay	Andreea Ehritt-Vanc	5–7, 3–6
Loss	2.	23 August 1999	Cuneo, Italy	Clay	Roberta Vinci	1–6, 2–6
Loss	3.	20 September 1999	Lecce, Italy	Clay	Roberta Vinci	3–6, 1–6
Loss	4.	22 June 2003	Lenzerheide, Switzerland	Clay	Melinda Czink	3–6, 3–6
Loss	5.	28 November 2005	Giza, Egypt	Clay	Galina Fokina	2–6, 4–6

Result	No.	Date	Tournament	Surface	Partner	Opponents	Score
Loss	1.	27 July 1998	Rabat, Morocco	Clay	Nina Schwarz	Susanne Filipp Bettina Resch	6–4, 5–7, 2–6
Loss	2.	17 August 1998	Maribor, Slovenia	Clay	Julia Adlbrecht	Linda Faltynkova Petra Plackova	2–6, 1–6
Win	1.	27 September 1998	Lecce, Italy	Clay	Katia Altilia	Giulia Casoni Stefania Chieppa	6–0, 6–2
Loss	3.	2 May 1999	Maglie, Italy	Clay	Jorgelina Torti	Silvia Disderi Anna Floris	0–6, 6–2, 2–6
Win	2.	21 June 1999	Alkmaar, Netherlands	Clay	Debby Haak	Jolanda Mens Anouk Sterk	6–4, 1–6, 6–3
Loss	4.	5 July 1999	Amersfoort, Netherlands	Clay	Adrienn Hegedűs	Natasha Galouza Debby Haak	6–7(2–7), 4–6
Loss	5.	27 September 1999	Fiumicino, Italy	Clay	Katalin Miskolczi	Olga Vymetálková Gabriela Navrátilová	3–6, 3–6
Win	3.	31 January 2000	Mallorca, Spain	Clay	Debby Haak	Aurélie Védy Maria Wolfbrandt	6–4, 3–6, 6–4
Win	4.	11 September 2000	Biograd, Croatia	Clay	Bianca Kamper	Mervana Jugić-Salkić Ljiljana Nanušević	6–3, 5–7, 7–5
Loss	6.	13 August 2001	Aosta, Italy	Clay	Luciana Masante	Kildine Chevalier Natacha Randriantefy	6–1, 2–6, 2–6
Loss	7.	27 September 2001	Spoleto, Italy	Clay	Luciana Masante	Silvia Disderi Anna Floris	4–6, 5–7
Win	5.	11 February 2002	Bergamo, Italy	Clay	Silvia Disderi	Zuzana Hejdová Renata Kučerová	7–5, 6–3
Loss	8.	3 June 2002	Staré Splavy, Czech Republic	Clay	Renata Kučerová	Eva Erbová Lenka Novotná	6–7(5–7), 0–6
Win	6.	1 July 2002	Mont de Marsan, France	Clay	Natacha Randriantefy	Séverine Beltrame Amandine Dulon	6–4, 6–2
Loss	9.	26 August 2002	Spoleto, Italy	Clay	Silvia Disderi	Alice Canepa Emily Stellato	2–6, 2–6
Loss	10.	9 February 2003	Bergamo, Italy	Hard (i)	Bianca Kamper	Darija Jurak Ana Vrljić	4–6, 4–6
Win	7.	10 March 2003	Makarska, Croatia	Clay	Daniela Klemenschits	Gabriela Niculescu Monica Niculescu	3–6, 7–6(9–7), 6–4
Win	8.	31 March 2003	Naples, Italy	Clay	Vanessa Menga	Oana Elena Golimbioschi Eszter Molnár	7–6(8–6), 6–3
Win	9.	7 April 2003	Torre del Greco, Italy	Clay	Giulia Meruzzi	Elisa Balsamo Debora Carmassi	6–4, 6–3
Loss	11.	10 August 2003	Cuneo, Italy	Clay	Lubomira Bacheva	Mervana Jugić-Salkić Darija Jurak	1–6, 2–6
Loss	12.	26 April 2004	Taranto, Italy	Clay	Patricia Wartusch	Daniela Klemenschits Sandra Klemenschits	2–6, 1–6
Win	10.	13 March 2005	Naples, Italy	Clay	Alberta Brianti	Anna Floris Giulia Meruzzi	6–4, 6–3
Loss	13.	21 March 2005	Rome, Italy	Clay	Ivana Abramović	Valentina Sulpizio Sandra Záhlavová	5–7, 7–5, 1–6
Win	11.	18 April 2005	Bari, Italy	Clay	Mervana Jugić-Salkić	Stefania Chieppa Romina Oprandi	6–3, 7–6(7–3)
Loss	14.	28 June 2005	Fano, Italy	Clay	Valentina Sulpizio	Gabriela Chmelinová Michaela Paštiková	2–6, 0–6
Win	12.	15 August 2005	Helsinki, Finland	Hard	Maria Geznenge	Emma Laine Essi Laine	7–5, 2–6, 6–4
Loss	15.	12 September 2005	Torre del Greco, Italy	Clay	Valentina Sulpizio	Mareike Biglmaier Jana Jurićová	2–6, 6–4, 3–6
Win	13.	15 November 2005	Mallorca, Spain	Clay	Gianna Doz	Cristina Bala Abella Berta Morata-Flaquer	6–4, 6–0
Loss	16.	22 November 2005	Giza, Egypt	Clay	Emilia Desiderio	Galina Fokina Raissa Gourevitch	4–6, 3–6
Loss	17.	13 March 2006	Rome, Italy	Clay	Gianna Doz	Darija Jurak Carmen Klaschka	2–6, 2–6
Loss	18.	18 April 2006	Bari, Italy	Clay	Darija Jurak	Romina Oprandi Caroline Schneider	5–7, 2–6
Loss	19.	3 July 2006	Naples, Italy	Clay	Emilia Desiderio	Valentina Sulpizio Verdiana Verardi	1–6, 3–6
Win	14.	8 August 2006	Jesi, Italy	Clay	Anaïs Laurendon	Kildine Chevalier Elena Vianello	6–0, 6–3
Win	15.	29 October 2006	Dubrovnik, Croatia	Clay	Teodora Mirčić	Aleksandra Lukič Patricia Vollmeier	6–4, 6–3
Loss	20.	26 November 2006	Cairo, Egypt	Clay	Biljana Pawlowa-Dimitrova	Alexandra Dulgheru Marcella Koek	6–7(4–7), 6–3, 6–7(5–7)
Loss	21.	26 March 2007	Foggia, Italy	Clay	Lisa Sabino	Stefania Chieppa Giulia Gatto-Monticone	1–6, 3–6
Loss	22.	21 August 2007	Wahlstedt, Germany	Clay	Natalia Kołat	Neda Kozić Antonia Matic	1–6, 6–2, 3–6
Win	16.	27 August 2007	Pörtschach, Austria	Clay	Eva-Maria Hoch	Taja Mohorčič Nataša Zorić	6–2, 6–2
Loss	23.	23 September 2007	Bratislava, Slovakia	Clay	Nicole Rottmann	Monika Kochanová Klaudia Malenovská	5–7, 6–7(4–7)
Loss	24.	1 October 2007	Castel Gandolfo, Italy	Clay	Amra Sadiković	Stefania Chieppa Giulia Gatto-Monticone	2–3 ret.
Loss	25.	8 October 2007	Reggio Calabria, Italy	Clay	Sandra Martinović	Marta Marrero María José Martínez Sánchez	1–6, 2–6
Win	17.	19 November 2007	Barcelona, Spain	Clay	Biljana Pawlowa-Dimitrova	Irina Kuzmina Sheila Solsona-Carcasona	6–3, 6–7(8–10), [10–3]
Win	18.	21 April 2008	Naples, Italy	Clay	Sara Savarise	Valeria Casillo Ekaterina Strogonova	6–3, 6–2

• Stefanie Haidner at the Women's Tennis Association
• Stefanie Haidner at the International Tennis Federation