Bank of the West was an American financial institution headquartered in San Francisco, California, United States. It had more than 600 branches and offices in the Midwest and Western United States.

It was founded in 1874 in San Jose, California, as the Farmers National Gold Bank of San Jose. Bank of the West was then owned by the French banking group BNP from 1979 to 2023. The acquisition of Bank of the West by the Canadian banking group Bank of Montreal (BMO) was completed in February 2023, with the intention of absorbing it into BMO's U.S. subsidiary BMO Harris Bank. Over the ensuing Labor Day weekend, the Bank of the West brand was retired, and all accounts and branches from both subsidiaries were converted and merged into the renamed BMO Bank, N.A. by September 5.