Hui people (回族), a Chinese ethnic group. They form one of the 56 nationalities officially recognized by the People's Republic of China

Hui (secret society), a Chinese term referring to a secret brotherhood.

Hui (linguistics), a subdivision of spoken Chinese.

Hui (Hawaiian), as in the movie North Shore, the Hui are local Hawaiian surfers on the North shore to whom Rick Kane, the film's hero, must prove his worth.

HUI MIDI mapping protocol (tm, acronym) for interfacing between digital audio workstations (DAWs) and connected hardware controllers.

Hui (Māori assembly), a social gathering in a Māori community, New Zealand

Hui (family name) (許) is a family name particularly for Cantonese-speaking Chinese.

Huì (濊), an ethnic group or category of ethnic group that formerly inhabited certain regions to the northeast of ancient China and parts of the Korean Peninsula. Also known as Ye (예) in Korean and as Wai (わい) in Japanese. See also Dongye, Yemaek, ethnic groups in Chinese history.

"Hui" ("Huy") (Russian: хуй) is a slang word which means "man's genitals". See Russian mat. Interesting coincedence: Common Chinese name/family name "Hui" sounds exactly like a Russian obscene word for the "dick", which is source of endless jokes in Russia.