Yes, most US visas are valid for multiple entries. US visas, such as the visitor (B1/B2) and student (F-1) visas, specifically offer multiple entries, allowing visa holders to enter the country multiple times during the validity of their visas. However, the stay period for each entry is limited to no more than 6 months for a US B1/B2 visa, with a final approval for entry decided by U.S. Customs and Border Protection officials at the port of entry. The I-94 record at the entry point contains details of your authorized stay period.