The 2018 Connecticut Open (also known as the 2018 Connecticut Open presented by United Technologies for sponsorship reasons) was a tennis tournament played on outdoor hard courts.

It was the 50th edition of the Connecticut Open, and part of the Premier Series of the 2018 WTA Tour.

It took place at the Cullman-Heyman Tennis Center in New Haven, Connecticut, United States, from August 19 through August 25.

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 using protected rankings: The following players received entry from the qualifying draw: The following players received entry as lucky losers: The following pair received a wildcard into the doubles main draw: The following pairs received entry as alternates: