Round Rock Express
- Location: Round Rock, TX
- League: Texas League 2000-2004; Pacific Coast League 2005-2019; Triple-A West 2021-
- Affiliation: Houston Astros 2000-2010, Texas Rangers 2011-2018; Houston Astros 2019-2019; Texas Rangers 2021-present
- Ballpark: The Dell Diamond
The Round Rock Express replaced the Edmonton Trappers in the Pacific Coast League in 2005, after playing in the Texas League from 2000 to 2004. Meanwhile, the Corpus Christi Hooks replaced Round Rock in the Texas League. One of the principal owners of the team is Nolan Ryan.