'''Wainaina''' is a surname. Notable people with the surname include:
*Angel Wainaina (1983–2009), Kenyan actress, radio presenter and rapper *Anthony Wainaina, Kenyan MP *Binyavanga Wainaina (1971–2019), Kenyan writer *Catherine Wainaina (born 1985), Kenyan beauty pageant winner *Eric Wainaina (musician) (born 1973), Kenyan singer-songwriter *Erick Wainaina (born 1973), Kenyan marathon runner *Fidelis Wainaina, Kenyan activist *Njoki Wainaina
{{surname|Wainaina}}