Hermenegild Casellas Bosch (1890 – 1969) was a Spanish footballer who played as a midfielder and later as defender.

First, as a midfielder, and later as a defender, he was one of the main architects of the team's football power in Catalonia, competing head-to-head against the likes of Barcelona and Espanyol,[2] being crucial in helping them to win three Catalan championships in 1912–13, 1913–14 and 1916–17, and he also was pivotal in helping Espanya reach the 1914 Copa del Rey Final, which still stands as the only Copa del Rey Final of the club's history, but they lost 1–2 to Athletic Bilbao, courtesy of a brace from Severino Zuazo.

[4] He played several matches for the Catalonia national team, against the likes of Basque Country, France and Madrid, the latter of which being the decisive game of the 1916 Prince of Asturias Cup, which ended in a 2–2 draw that proved enough for Catalonia to lift their first-ever piece of silverware.

Around 1916 he moved to El Pla de Santa Maria, where he introduced football to the town, and where he lived until his death in 1969, at the age of 79.

This biographical article related to a Spanish association football defender is a stub.