The 2021 Silicon Valley Classic (also known as the Mubadala Silicon Valley Classic for sponsorship reasons) was a professional tennis tournament played on hard courts. It was the 49th edition of the tournament, and part of the WTA 500 of the 2021 WTA Tour. It took place between 2 and 8 August 2021 in San Jose, California. It was the first women's event on the 2021 US Open Series.
The following players received wildcards into the main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following pairs received wildcards into the doubles main draw:
The following pair received entry as a alternates: