3-Hydroxyasparagine also known as β-hydroxyasparagine (beta-hydroxyasparagine) is a modified asparagine amino acid.

It appears in posttranslational modification of cbEGF-like domains which can occur in humans and other Eukaryotes.

The amino acid code used for this is Hyn.

The modified amino acid residue is found in fibrillin-1.

[1] This amino acid is also found in urine.