Grace Sari Ysidora (born 11 May 1993) is an Indonesian former tennis player.

She made her debut as a professional in 2008, aged 15, at an ITF tournament in Jakarta.

In that year, she reached the final of the women's doubles of the inaugural 2008 Garuda Indonesia Tennis Masters, partnered by Septi Mende.

Her greatest success was in reaching Round 3 at the Australian Open in the girls' singles competition.

Ysidora was Indonesia's sole representative in tennis at the 2010 Summer Youth Olympics.