The 2018 St. Petersburg Ladies' Trophy was a professional tennis tournament played on indoor hard courts.

It was the 9th edition of the tournament and third time as a WTA Premier tournament.

It was part of the 2018 WTA Tour and was held between 29 January and 4 February 2018.

1Qualifiers prize money is also the Round of 32 prize money.

*per team The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: The following pair received a wildcard into the doubles main draw: