Isabelle Wallace (born 7 September 1996) is a Scottish-Australian former tennis player.

She made her WTA Tour main-draw debut at the 2018 Australian Open, after being awarded a wildcard into the women's doubles with Naiktha Bains.

She won six singles and two doubles titles on the ITF Circuit.

After six years, Wallace and her family moved back to Scotland where she then chose to represent Great Britain.

In 2015, Wallace made the decision to represent Australia again in international sporting competitions due to lack of support from the Lawn Tennis Association.