This is a list of companies founded by Harvard University alumni, including attendees who enrolled in degree programs at Harvard University but did not eventually graduate. Companies founded by alumni of Radcliffe College ("Harvard Annex", 1879-1999) are not included in this list. This list is not exhaustive, as it only includes notable companies of which the founding and development history is well recorded by reliable sources. In particular, subsidiaries are listed with their owners in parentheses.