Timo Nieminen (born 6 October 1981 in Helsinki) is a retired professional Finnish tennis player.

He reached his highest ATP Tour singles ranking of World No. 254 in July 2003.^[1] Nieminen primarily played on the Futures circuit and the Challenger circuit.^[2] He has been a member of the Finland Davis Cup team since 2002, posting a 2–12 record in singles and 0–1 record in doubles in 12 ties.^[3]

He has no relation to Jarkko Nieminen.

No.	Date	Tournament	Surface	Opponent in the final	Score
1.	2002	Jūrmala	Clay	Andrei Cherkasov	4–6, 6–4, 6–2
2.	2003	Savitaipale	Clay	Michail Elgin	6–3, 6–4
3.	2003	Vierumäki	Hard	Mait Künnap	6–3, 6–2
4.	2003	Gothenburg	Hard (i)	Robert Lindstedt	6–2, 4–6, 6–1
5.	2006	Kraków	Clay	Julian Reister	2–6, 6–3, 6–1
6.	2007	Sydney	Hard	Ti Chen	7–5, 6–4
7.	2008	Oslo	Clay	Stian Boretti	6–3, 6–4
8.	2009	Vierumäki	Clay	Juho Paukku	7–5, 2–6, 6–4
9.	2009	Lidköping	Hard (i)	Frederik Nielsen	6–2, 6–2
10.	2010	Alkmaar	Clay	Michal Schmid	6–1, 6–3
11.	2010	Vilnius	Clay	Deniss Pavlovs	7–5, 6–2
12.	2010	Leimen	Hard (i)	Holger Fischer	6–3, 7–5
13.	2011	Båstad	Clay	Cătălin Gârd	6–3, 6–7, 6–4
14.	2011	Vierumäki	Clay	Vladimir Ivanov	6–3, 6–1
15.	2011	Isernhagen	Hard (i)	Peter Torebko	6–2, 6–4
16.	2012	Båstad	Clay	Lucas Pouille	2–6, 7–5, 6–2

• List of Finland Davis Cup team representatives

• Timo Nieminen at the Association of Tennis Professionals
• Timo Nieminen at the International Tennis Federation
• Timo Nieminen at the Davis Cup