As a U.S. visa holder, you are subject to the U.S. laws governing travel to and from Cuba. At this time travel to Cuba is prohibited for tourist purposes. This restriction also includes tourist travel to Cuba from or through a third country such as Mexico or Canada. If the purpose of your trip falls within the acceptable travel categories as laid out by the U.S. Treasury, you must contact Harvard’s Global Support Services office to inquire about the required licenses for travel. 

U.S. Government Restrictions on Travel to Cuba (Excerpt from U.S. Department of State country specific information on Cuba)

“Entry / Exit Requirements, Travel Transaction Limitations: The Cuban Assets Control Regulations are enforced by the U.S. Department of the Treasury and affect all U.S. citizens and permanent residents wherever they are located, all people and organizations physically located in the United States regardless of their visa status, and all branches and subsidiaries of U.S. organizations throughout the world. The regulations require that persons subject to U.S. jurisdiction be licensed in order to engage in any travel-related transactions pursuant to travel to, from, and within Cuba. Transactions related to tourist travel are not licensable. This restriction includes tourist travel to Cuba from or through a third country such as Mexico or Canada. U.S. law enforcement authorities enforce these regulations at U.S. airports and pre-clearance facilities in third countries. Travelers who fail to comply with Department of the Treasury regulations could face civil penalties and criminal prosecution upon return to the United States.”

Please review the following web links for information on U.S. economic sanctions on Cuba and a Department of State profile on Cuba:

U.S. Department of State

U.S. Department of the Treasury