| Date: | 24–30 August |
| Edition: | 1st |
| Surface: | Clay |
| Location: | Trieste, Italy |
| Champs: |  Carlos Alcaraz |
| Champd: | Ariel Behar /  Andrey Golubev |
The 2020 Internazionali di Tennis Città di Trieste was a professional tennis tournament played on clay courts. It was the 1st edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Trieste, Italy between 24 and 30 August 2020.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Australia | Alexei Popyrin | 103 | 1 | |
 France | Antoine Hoang | 136 | 2 | |
| Yannick Hanfmann | 143 | 3 | ||
 Italy | Lorenzo Giustino | 153 | 4 | |
| Italy | Roberto Marcora | 158 | 5 | |
| Italy | Alessandro Giannessi | 160 | 6 | |
 Austria | Jurij Rodionov | 166 | 7 | |
 Slovakia | Lukáš Lacko | 172 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry into the singles main draw using a protected ranking:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
See main article: 2020 Internazionali di Tennis Città di Trieste – Singles.
Carlos Alcaraz def. Riccardo Bonadio 6–4, 6–3.See main article: 2020 Internazionali di Tennis Città di Trieste – Doubles.
Andrey Golubev def. Hugo Gaston / Tristan Lamasine 6–4, 6–2.