Arnulfo is a masculine given name. It is the Spanish and Italian form of the German name Arnulf.
As a given name
Arnulfo Aparri, Jr., Filipino murder suspect Arnulfo Arias (1901–1988), Panamanian president Arnulfo Briceño (1938–1989), Colombian songwriter and lawyer Arnulfo Fuentebella (1945–2020), Filipino lawyer Arnulfo Mendoza (1954–2014), Mexican artist Arnulfo Trejo (1922–2002), American librarian Arnulfo Valentierra (b. 1978), Colombian footballer
As a surname
Pietro Arnulfo (b. 1988), Italian footballer