| Birth Date: | 21 August 1934 |
| Birth Place: | , Chuvash ASSR, Russian SFSR, Soviet Union (now Chuvashia, Russia) |
| Death Place: | Moscow, Russia |
| Movement: | Neo-surrealism |
| Signature: | Signature of Gennadiy Aigui.svg |
Gennadiy Nikolayevich Aygi (Russian: Генна́дий Никола́евич Айги́|p=ɡʲɪˈnadʲɪj nʲɪkɐˈlajɪvʲɪtɕ ɐjˈɡʲi|a=Gyennadiy Nikolayevich Aygi.ru.vorb.oga, Chuvash: Геннадий Николаевич Айхи; 21 August 1934 - 21 February 2006) was a Chuvash poet and a translator. His poetry is written both in Chuvash and in Russian.
He was born in the village of Shaimurzino (Çĕnyal), Chuvashia (USSR), moved to Moscow in 1953 and stayed there for the rest of his life. Aygi started writing poetry in the Chuvash language in 1958.
Among the recognitions he has won are the Andrey Bely Prize (1987), the Pasternak Prize (2000, the first to be awarded this), the Prize of the French Academy (1972), the Petrarch Prize (1993), the Golden Wreath of the Struga Poetry Evenings in 1994 and the Jan Smrek Prize (Bratislava, Slovakia).
In 2003 Aygi participated in the "international literature festival berlin" .
Sofia Gubaidulina set several of his poems to music in her cycle Jetzt immer Schnee ("Now always snow").
His son Aleksey Aygi is a composer.