Andriy Grechylo (Ukrainian: Андрій Богданович Ґречило; Andriy Bohdanovych Grechylo / Hrechylo / Greczylo), is an Ukrainian historian, heraldist and vexillologist. During his career he has published several books and designed hundreds of coats of arms, flags, banners and seals for over 1000 different municipalities and institutions.
Andriy Grechylo was born in November 19, 1963 in Lviv, Ukraine. He studied architecture at the Lviv Polytechnic. Since 1990, he was a research worker (scholar) of the Hrushevskyi Institute of Ukrainian Archeography and Source Studies, National Academy of Science of Ukraine.
Grechylo received his PhD in historical science in 1996 and defended a dissertation titled "Ukrainian Municipal Heraldry: Tendencies of Evolution". In 2012, he defended a dissertation titled "Ukrainian Territorial Heraldry" and received his DSc.
In 1990, he has founded the Ukrayinske Heraldychne Tovarystvo (Ukrainian Heraldry Society) – since 1995 a member of FIAV (Federation internationale des associations vexillologiques) and CIGH (Confédération Internationale de Généalogie et d’Héraldique). Andriy Grechylo is an associate member of the Académie Internationale d'Héraldique (International Academy of Heraldry) and president of UHT (Ukrainian Heraldry Society).
Since 1993, he is an editor of the bulletin Znak (The Sign). He also is an editor of the yearly journal Genealogichni zapysky (Genealogical Notes). Grechylo is co-author of the Small State Coat of Arms of Ukraine. He has also designed flags and arms for provinces, districts, cities, towns, villages, universities, organisations, ecclesiastical provinces and for individuals. Although he is known mainly for his expertise in heraldry and vexillology.