Merilo is an Estonian surname. Notable people with the surname include:

 Andrus Merilo (born 1973), Estonian military commander
 Jaanika Merilo (born 1979), Ukrainian-Estonian politician, philanthropist and author
 Kärt Kross-Merilo (born 1968), Estonian actress

See also

 Merilo Pravednoye, Kievan Rus' manuscript

Estonian-language surnames