Exhibit 8.1

List of Significant Subsidiaries of United Microelectronics Corporation

Company	Jurisdiction of Incorporation	Percentage of Ownership as of December 31, 2017
UMC Group (USA)	U.S.A.		100.00	%
United Microelectronics (Europe) B.V.	The Netherlands		100.00	%
UMC Capital Corp.	Cayman Islands		100.00	%
TLC Capital Co., Ltd.	Taiwan, R.O.C.		100.00	%
UMC New Business Investment Corp.	Taiwan, R.O.C.		100.00	%
Green Earth Limited	Samoa		100.00	%
Fortune Venture Capital Corp.	Taiwan, R.O.C.		100.00	%
UMC Investment (Samoa) Limited	Samoa		100.00	%
UMC Capital (USA)	U.S.A.		100.00	%
ECP Vita Pte. Ltd.	Singapore		100.00	%
Soaring Capital Corp.	Samoa		100.00	%
Unitruth Advisor (Shanghai) Co., Ltd.	China		100.00	%
Tera Energy Development Co., Ltd.	Taiwan, R.O.C.		100.00	%
United Microchip Corporation	Cayman Islands		100.00	%
Nexpower Technology Corp.	Taiwan, R.O.C.		87.06	%
Wavetek Microelectronics Corporation	Taiwan, R.O.C.		78.47	%
Everrich Energy Investment (HK) Limited	China		100.00	%
Everrich (Shandong) Energy Co., Ltd.	China		100.00	%
Unistars Corp.	Taiwan, R.O.C.		83.69	%
SocialNex Italia 1 S.R.L.	Italy		87.06	%
UMC (Beijing) Limited	China		100.00	%
Wavetek Microelectronics Investment (Samoa) Limited	Samoa		78.47	%
Wavetek Microelectronics Corporation (USA)	U.S.A.		78.47	%
Best Elite International Limited	British Virgin Islands		96.66	%
Infoshine Technology Limited	British Virgin Islands		96.66	%
Oakwood Associates Limited	British Virgin Islands		96.66	%
Hejian Technology (Suzhou) Co., Ltd.	China		96.66	%
UnitedDS Semiconductor (Shandong) Co., Ltd.	China		96.66	%
United Semiconductor (Xiamen) Co., Ltd.	China		50.34	%
UMC Group Japan	Japan		100.00	%
UMC Korea Co., Ltd.	Korea		100.00	%
Omni Global Limited	Samoa		100.00	%
United Microtechnology Corporation (California)	U.S.A.		100.00	%
United Microtechnology Corporation (New York)	U.S.A.		100.00	%
Sino Paragon Limited	Samoa		100.00	%
UMC Technology Japan Co., Ltd.	Japan		100.00	%