Vanguard International Semiconductor Corporation (VIS) is a Taiwanese specialized IC foundry service provider, founded in December 1994 in Hsinchu Science Park by Morris Chang.

In March 1998, VIS became a listed company on the Taiwan Over-The-Counter Stock Exchange (OTC) with the main shareholders TSMC, National Development Fund, Executive Yuan and other institutional investors.

In 2000, VIS announced its plan to transform from a DRAM manufacturer into a foundry service provider.

As of February 2004, VIS completely terminated its DRAM production and became a pure-play foundry company.

[citation needed] As of 2018, VIS has a production capacity of approximately 199,000 wafers per month.