Joana Amorim Cortez dos Santos (born 11 January 1979) is a former professional Brazilian tennis player.

In her career, Cortez won seven singles and 26 doubles titles on the ITF Women's Circuit. On 17 September 2001, she reached her best singles ranking of world No. 204. On 5 November 2001, she peaked at No. 115 in the doubles rankings.

Cortez represented Brazil at the 2000 Summer Olympics in women's doubles, reaching the second round with Vanessa Menga. A year previously, the pair won gold at the 1999 Pan American Games. Cortez won gold again in 2003, partnering Bruna Colósio, and in 2007 won bronze with Teliana Pereira in Rio.

Playing for Brazil in the Fed Cup, Cortez has a win–loss record of 23–14.

Cortez played and lost two doubles matches in major events, at the 2001 US Open and in 2002 in Australia.

After retiring from the tour, she became a beach tennis player.