Eucalyptus × beyeri is a hybrid species of tree that is endemic to New South Wales, Australia.

Bentham noted that William Woolls had given it the common name narrow-leaved iron-bark.

[2][3] In 1917, Richard Thomas Baker raised the variety to species status with the name Eucalyptus beyeri.

[4][5] In 1990, Lawrie Johnson and Ken Hill suggested that Bentham's type specimen was a hybrid between a previously undescribed species and E. crebra.

[6][7] This interpretation is accepted by the Australian Plant Census but not universally, and Eucalyptus beyeri is still listed in the Flora of Australia.