EXHIBIT 8.1

Significant Subsidiaries of O₂MICRO INTERNATIONAL LIMITED

O₂Micro, Inc., a California corporation

O₂Micro Electronics, Inc., a Taiwan company

O₂Micro International Japan Limited, a Japanese company

O₂Micro PTE Limited-Singapore, a Singapore company

Aotu Micro (Wuhan) Co., Ltd., a Chinese company

O₂Micro (Beijing) Co., Ltd., a Chinese company

O₂Micro (China) Co., Ltd., a Chinese company

O₂Micro (Chengdu) Co., Ltd., a Chinese company

O₂Security Limited, a Cayman Islands company

International Asset Holding Company, a Cayman Islands company

O₂Security (Wuhan) Co., Ltd., a Chinese company