The 2021 Elle Spirit Open was a professional women's tennis tournament played on outdoor clay courts.

It was the fourth edition of the tournament which was part of the 2021 ITF Women's World Tennis Tour.

It took place in Montreux, Switzerland between 6 and 12 September 2021.

[1] The following players received wildcards into the singles main draw: The following player received entry using as a special exempt: The following players received entry from the qualifying draw: