[[Morquio syndrome]] (referred to as [[mucopolysaccharidosis]] IV or Morquio's) is an autosomal recessive [[mucopolysaccharide]] storage disease (see also lysosomal storage disorder), usually inherited.

It is a rare type of birth defect with serious consequences. When the body cannot process certain types of mucopolysaccharides, they build up or are eliminated, causing various symptoms. These involve accumulation of [[keratan sulfate]].