The Black Bauhinia flag (Chinese: 黑洋紫荊旗; Jyutping: hak1 joeng4 zi2 ging1 kei4; Cantonese Yale: hāk yèuhng jí gīng kèih) is a variant of the flag of Hong Kong with a black background and (in most versions) a modified bauhinia flower.

However, Luk was also of the opinion that the source of the flag cannot be reliably traced without sufficient evidence, and as such, legal action cannot be taken.

[3] The Chinese and Hong Kong governments criticised the Ukrainian Ministry of Defence for including the Black Bauhinia flag in a video it posted on Twitter on 18 December 2022.

In the video, the Ukrainian government thanked the foreign volunteers in the international legion for fighting against invading Russian forces.

The Chinese foreign ministry responded by asking Ukraine to refrain from showing support to "anti-China forces in Hong Kong".