| Filoil EcoOil Preseason Cup | |
| Year: | 2023 |
| Other Titles: | 16th Filoil EcoOil ECJ Preseason Cup |
| Country: |  Philippines |
| City: | San Juan |
| Num Teams: | 20 |
| Venues: | Filoil EcoOil Centre |
| Count: | 1 |
| Prev Season: | 2022 (15th) |
| Next Season: | 2022 (17th) |
The 2023 Filoil EcoOil Preseason Cup, officially referred to as the 16th Filoil EcoOil Preseason Cup, is the sixteenth edition of the collegiate basketball tournament organized by Filoil EcoOil Sports. The tournament was contested by seven teams from the University Athletic Association of the Philippines (UAAP), ten from the National Collegiate Athletic Association (NCAA), and one each from National Athletic Association of Schools, Colleges and Universities (NAASCU), Universities and Colleges Basketball League (UCBL), and National Collegiate Athletic Association – South (NCAA South). All games were held at the Filoil EcoOil Centre in San Juan.
The NU Bulldogs entered this tournament as the defending Preseason Cup champions.[1]
In the elimination round, the teams are grouped by association. From there, the teams play in a single round-robin tournament. Teams in both brackets play nine games each. Teams are ranked by win-loss records with the top four teams from each association group advancing to the playoffs.
To seal the fourth seed in both the UAAP and NCAA brackets, both Far Eastern University and Colegio de San Juan de Letran had to play a two-game play-in tournament against Jose Maria College Foundation and Guang Ming College, respectively, with the highest aggregate score from each matchup earning the No. 4 seed in the quarterfinals and taking on top seeds University of Perpetual Help System DALTA and De La Salle University.[2]
Both the JMC Kings and Guang Ming Flying Dragons qualified from Luzon and VisMin qualifiers.
The single-elimination playoffs started on June 14, 2023, with the crossover quarterfinals, where the first-seeded teams play the fourth-seeded team from the opposing association group, same goes for the second-seeded and third-seeded teams.