Julio Walter Montero Castillo (born 25 April 1944) is a Uruguayan former professional footballer who played as a defender.

[1] He later played for Independiente of Argentina, and Spanish side Granada.

[citation needed] He made 64 La Liga appearances for Granada between 1973 and 1975, scoring two goals.

[2] He made a total of 68 Copa Libertadores appearances between 1966 and 1973.

[3] He represented the Uruguay national team in the 1970 FIFA World Cup (playing in all six matches) and the 1974 FIFA World Cup.