Matti Timonen (born 10 October 1953) is a Finnish former professional tennis player.

[1] Timonen won 24 national championships, including three outdoor and five indoor singles titles.

[2] On the professional tour, he was ranked as high as 257 in the world and had a second round appearance at the 1975 New Zealand Open, where he lost in five sets to the fourth-seeded Syd Ball.

He played for the Finland Davis Cup team from 1972 to 1982, featuring in 35 rubbers.

In 1980 he won a singles rubber over France's Pascal Portes.