Several outcrops of both ophiolitic belts of the Guatemalan Central Cordillera are studied. The southern belt near its southern margin is mostly made up of chrysotile-lizardite serpentinite rich in inclusions of various types of rocks. This margin has all the characteristics of a typical "melange" zone. Towards the north of this same belt there is a transition to massive antigorite serpentinite. The northern ultramafic belt is essentially composed of partly serpentinized peridotite grading into a chrysotile-lizardite serpentinite, which is in a much less sheared state than the southern serpentinites. Three main types of inclusions are described: rodingites, sialic rocks (albitites and granites) and metamorphic rocks. The origin and emplacement of these rocks are discussed. It seems very probable that Guatemalan peridotites and associated rocks were once part of an oceanic crust.