Gitahi is a surname of Kenyan origin. Notable people with the surname include:
Githinji Gitahi (born 1970), Kenyan medical doctor Godfrey Gitahi Kariuki (1938–2017), Kenyan politician Julius Gitahi (born 1978), Kenyan long-distance runner Linus Gitahi (born 1964), Kenyan businessman and executive Mercy Wanjiru Gitahi (born 1993), Kenyan athletics competitor Robert Gitahi (born 1962), Kenyan Professor