Summerhayes is an English surname. Notable people with the surname include:
David Summerhayes (active 196568), Welsh footballer Edwin Summerhayes (1868–1944), Australian architect Geoffrey Edwin Summerhayes (1928–2010), Australian architect Glenn Summerhayes (born 1954), New Zealand archaeologist Katie Summerhayes (born 1995), British freestyle skier, sister of Molly Martha Summerhayes (18441926), American memoirist Molly Summerhayes (born 1997), British freestyle skier, sister of Katie V. S. Summerhayes (18971974), English botanist Violet Summerhayes (1878–1974), Canadian tennis player
See also Summerhayesia, a genus of flowering plants