The 2021 Saint Petersburg Challenger II was a professional tennis tournament played on hard courts. It was the second edition of the Saint Petersburg Challenger which was part of the 2021 ATP Challenger Tour. It took place in Saint Petersburg, Russia between 8 and 14 March 2021.
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw as a special exempt:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
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