Kirwa is a surname of Kenyan origin. Notable people with the surname include:
Alfred Kirwa Yego (born 1986), Kenyan middle-distance runner Eunice Kirwa (born 1984), Kenyan-Bahraini distance runner Francis Kirwa (born 1974), Kenyan-Finnish marathon runner Gilbert Kirwa (born 1985), Kenyan marathon runner Henry Kiprono Kirwa, Kenyan Paralympic distance runner Julius Kirwa (born 1989), Kenyan sprinter Kipruto Rono Arap Kirwa, Kenyan politician Leonard Kirwa Kosencha (born 1994), Kenyan middle-distance runner Solomon Kirwa Yego (born 1987), Kenyan half marathon runner Wilson Kirwa (born 1974), Kenyan-Finnish distance runner and writer