Ricardo Diéz, born as Emetério Seledônio Díez[1] (11 February 1900 – 27 April 1971), was a Uruguayan football coach who mainly worked in Brazil.

In 1937 Diéz won with provincial Grêmio Foot-Ball Santanense from Santana do Livramento the Campeonato Gaúcho, the only major title in the club's history.

In 1941 he was Campeonato Pernambucano runner-up with Sport Recife, where he has been often attributed with the discovery of World Cup 1950 star striker Ademir de Menezes.

In 1950 he guided Atlético on its successful trip to Central Europe during the northern winter, which became part of the club's folklore and led to its nickname Campeões do Gelo, the "Ice Champions".

In total he guided the club in 168 matches, a statistic only outdone by three other coaches, amongst them Telê Santana.