The import of proteins into the space between the inner and outer mitochondrial membranes.
Synonyms:
exact_synonym:
mitochondrial intermembrane space protein import; protein import into mitochondrial IMS; protein transport into mitochondrial IMS; protein transport into mitochondrial intermembrane space
narrow_synonym:
protein import into mitochondrial intermembrane space, direct; protein import into mitochondrial intermembrane space, nonconservative