Haidomyrmecinae, occasionally called hell ants, are an extinct subfamily of ants (Formicidae) known from Cretaceous fossils primarily found in amber from North America, South America, Europe, and Asia, spanning the late Aptian to Campanian, around 113 to 79 million years ago. The subfamily was first proposed in 2003 but had been subsequently treated as the tribe Haidomyrmecini and placed in the extinct ant subfamily Sphecomyrminae. Reevaluation of the Haidomyrmecini in 2020 led to the elevation of the group back to the subfamily. The family contains nine genera and 13 species.