Hypocalymma angustifolium (White Myrtle) is a species of shrub in the myrtle family Myrtaceae, endemic to the south west region of Western Australia. It grows up to 1.5 metres in height and has arching stems with narrow leaves. White or white and deep pink flowers are produced between June and October (early winter to mid spring) in its native range. The species was first formally described by botanist Stephan Endlicher in 1837 as Leptospermum angustifolium. The species was transferred to the genus Hypocalymma in 1843 by Johannes Schauer.