Amaurobius fenestralis is a species of spider in the family Amaurobiidae.

The specific name similis is based on its similarity to A.  fenestralis.

The two species are difficult to distinguish: A. fenestralis tends to be smaller and lighter in colouration when an adult.

Both species have V-shaped markings on their abdomens, with A. fenestralis usually having two or three, and A. similis four.

Examination of the genitalia may be needed for precise identification.