Maria João Koehler (born 8 October 1992) is a retired Portuguese tennis player.

Koehler won four singles and four doubles titles on the ITF Women's Circuit in her career.

Playing for the Portugal Fed Cup team, Koehler has a win–loss record of 11–20.

[1] Born in Porto, Koehler made her debut on the ITF Women's Circuit at the age of 14 at a $10k event in Braga.

She made her WTA Tour main-draw debut at the 2009 Estoril Open.