Erwin Arturo Frei Bolívar (18 November 1939 – January 2022) was a Chilean politician who was a senator and presidential candidate in the 1999 election.

For a few years he was assistant professor of tax law, while also working as a lawyer for the Minister of Finance.

After the 1973 Chilean coup d'état, he retired from politics and dedicated himself to private practice, and also to running the Irene Frei Montalva foundation, which provided free daycare for children of poor families.

After the return of the democracy, Frei was elected senator in 1989 and served as chairman of the Armed Forces Committee where he developed strong links with the military.

After Chilean dictator Augusto Pinochet's arrest in the United Kingdom, Frei visited him in London and his independent presidential campaign to succeed his cousin Eduardo Frei Ruiz-Tagle as President was seen as a maneuver by the general to prevent Ricardo Lagos from winning the election.