Zhou Hongyi (Chinese: ???; pinyin: Zhou Hóngyi; born 4 October 1970) is a Chinese billionaire entrepreneur.
He is the co-founder, chairman and CEO of the Internet security company Qihoo 360.
As of November 2018, he is ranked #45 on Forbes China Rich List 2018 and #135 on Forbes Billionaires 2018, with an estimated net worth of $4.7 billion.