United Microelectronics Corporation (UMC; Chinese: 聯華電子; pinyin: Liánhuá Diànzǐ) is a Taiwanese company based in Hsinchu, Taiwan.

It was founded as Taiwan's first semiconductor company in 1980 as a spin-off of the government-sponsored Industrial Technology Research Institute (ITRI).

[5] The United States Department of Justice indicted UMC and Chinese firm Fujian Jinhua in 2018, alleging that they conspired to steal intellectual property from U.S. company Micron.

[12] In November 2021, UMC and Micron agreed to withdraw complaints against each other globally following a years-long legal dispute over intellectual property rights (IP).

[17] In February 2024, US District Judge Maxine M. Chesney in San Francisco ruled that the US prosecutors failed to prove that Chinese firm, Fujian Jinhua had misappropriated trade secrets from Micron Technology Inc.