Katharina Melissa Lehnert (born 18 February 1994) is a Filipino-German former tennis player. Lehnert has a German father and a Filipino mother; she represented Germany until 2013 when she decided to represent the Philippines.

Lehnert has a career-high WTA singles ranking of No. 389, achieved on 22 April 2013. On 24 August 2015, she peaked at No. 451 of the doubles rankings. In her career, she won four singles titles and three doubles titles on the ITF Circuit.

Playing for Philippines Fed Cup team, Lehnert scored a win–loss record of 15–10.

Result	No.	Date	Tournament	Surface	Opponent	Score
Loss	1.	12 May 2012	ITF Båstad, Sweden	Clay	Eugenie Bouchard	6–7(4), 0–6
Win	1.	26 August 2012	ITF Braunschweig, Germany	Clay	Cindy Burger	6–4, 2–6, 7–6(6)
Loss	2.	8 April 2013	ITF Antalya, Turkey	Hard	Viktorija Golubic	2–6, 3–6
Win	2.	12 January 2015	ITF Sharm El Sheikh, Egypt	Hard	Eva Wacanno	7–5, 3–6, 6–4
Win	3.	31 August 2015	ITF Engis, Belgium	Clay	Vivian Heisen	6–3, 2–6, 6–1
Loss	3.	7 September 2015	ITF Prague, Czech Republic	Clay	Lenka Juríková	3–6, 4–6
Win	4.	17 October 2015	ITF Sharm El Sheikh, Egypt	Hard	Veronika Miroshnichenko	6–4, 6–3
Loss	4.	15 October 2016	ITF Hua Hin, Thailand	Hard	Li Yixuan	6–2, 4–6, 3–6

Result	No.	Date	Tournament	Surface	Partner	Opponents	Score
Loss	1.	9 November 2009	ITF Manila, Philippines	Hard	Czarina Arevalo	Han Na-lae Yoo Mi	0–6, 3–6
Loss	2.	22 August 2011	ITF Braunschweig, Germany	Clay	Sabrina Baumgarten	Huỳnh Phương Đài Trang Karen Barbat	2–6, 4–6
Loss	3.	18 March 2012	ITF Amiens, France	Clay (i)	Katharina Negrin	Bernice van de Velde Nicolette van Uitert	6–2, 6–7(7), [6–10]
Win	1.	1 April 2013	ITF Antalya, Turkey	Hard	Viktorija Golubic	Martina Borecká Petra Krejsová	5–7, 6–3, [10–7]
Loss	4.	15 July 2013	ITF Imola, Italy	Carpet	Alice Matteucci	Lyudmyla Kichenok Jeļena Ostapenko	4–6, 6–3, [3–10]
Loss	5.	16 September 2013	ITF Antalya	Hard	Chantal Škamlová	Deniz Khazaniuk Ksenia Palkina	7–6(5), 6–7(3), [8–10]
Loss	6.	28 February 2014	ITF Bron, France	Hard (i)	Anna Klasen	Alyona Sotnikova Isabella Shinikova	7–5, 6–7(5), [5–10]
Win	2.	5 April 2014	ITF Manama, Bahrain	Hard	Michaela Frlicka	Linda Dubská Evgeniya Svintsova	6–0, 6–2
Win	3.	4 May 2015	ITF Puszczykowo, Poland	Hard	Margarita Lazareva	Maria Fernanda Alves Zuzana Zlochová	6–3, 6–3
Loss	7.	29 June 2015	Bella Cup, Poland	Clay	Magdalena Fręch	Ekaterine Gorgodze Sofia Shapatava	4–6, 4–6
Loss	8.	16 August 2015	Ladies Open Hechingen, Germany	Clay	Vivian Heisen	Andrea Gámiz Anastasiya Vasylyeva	6–4, 6–7(4), [3–10]
Loss	9.	16 July 2016	ITS Cup, Czech Republic	Clay	Anastasiya Shoshyna	Ema Burgic Bucko Jasmina Tinjic	5–7, 3–6
Loss	10.	3 February 2017	ITF Almaty, Kazakhstan	Hard (i)	Pia König	Olga Doroshina Polina Monova	1–6, 2–6

Edition	Round	Date	Location	Against	Surface	Opponent	W/L	Score
2015 Fed Cup	Asia/Oceania Zone	15 April 2015	Hyderabad, India	Singapore	Hard	Wee Khee-yen	W	6–1, 6–0
	Asia/Oceania Zone	17 April 2015	Hyderabad, India	Indonesia	Hard	Deria Nur Haliza	W	6–4, 6–2
	Asia/Oceania Zone	18 April 2015	Hyderabad, India	India	Hard	Ankita Raina	W	2–6, 7–5, 7–5
2016 Fed Cup	Asia/Oceania Zone	11 April 2016	Hua Hin, Thailand	Iran	Hard	Sara Amiri	W	6–1, 6–4
	Asia/Oceania Zone	13 April 2016	Hua Hin, Thailand	Pacific Oceania	Hard	Steffi Carruthers	W	6–0, 6–2
	Asia/Oceania Zone	14 April 2016	Hua Hin, Thailand	Hong Kong	Hard	Zhang Ling	W	6–1, 6–4
	Asia/Oceania Zone	14 April 2016	Hua Hin, Thailand	Singapore	Hard	Stefanie Tan	W	3–6, 6–3, 6–4

Edition	Round	Date	Location	Against	Surface	Partner	Opponents	W/L	Score
2015 Fed Cup	Asia/Oceania Zone	15 April 2015	Hyderabad, India	Singapore	Hard	Anna Clarice Patrimonio	Angeline Devi Devanthiran Sarah Pang	W	6–1, 6–2
	Asia/Oceania Zone	17 April 2015	Hyderabad, India	Indonesia	Hard	Anna Clarice Patrimonio	Ayu Fani Damayanti Lavinia Tananta	W	6–7(12), 6–4, 6–2
	Asia/Oceania Zone	18 April 2015	Hyderabad, India	India	Hard	Anna Clarice Patrimonio	Sania Mirza Prarthana Thombare	L	3–6, 3–6
2016 Fed Cup	Asia/Oceania Zone	13 April 2016	Hua Hin, Thailand	Pacific Oceania	Hard	Khim Iglupas	Steffi Carruthers Abigail Tere-Apisah	W	6–4, 6–3

• Katharina Lehnert at the Women's Tennis Association
• Katharina Lehnert at the International Tennis Federation
• Katharina Lehnert at the Billie Jean King Cup (archived)
• Katharina Lehnert Filipino Female Tennis Player