Juniperus lutchuensis (Ryukyu Islands juniper; Japanese: オキナワハイネズ Okinawa-hainezu; syn. Juniperus taxifolia var. lutchuensis (Koidz.) Satake) is a species of juniper, native to the Ryukyu Islands, Izu Ōshima and the adjacent coast of Shizuoka Prefecture in Japan.
'Juniperus lutchuensis is an evergreen coniferous shrub growing to a height of 1–3 m. The leaves are needle-like, in whorls of three, light green, 7–14 mm long and 1-1.5 mm broad, with a double white stomatal band (split by a green midrib) on the inner surface. It is dioecious, with separate male and female plants.
The seed cones are berry-like, green ripening in 18 months to purple-brown; they are spherical, 8–9 mm diameter, and have three or six fused scales in one or two whorls of three; the three larger scales each bear a single seed. The seeds are dispersed when birds eat the cones, digesting the fleshy scales and passing the hard seeds in their droppings. The pollen cones are yellow, 5 mm long.
Some authors treat it as a synonym of Juniperus taxifolia from the Bonin Islands, while others treat it as a variety of it, Juniperus taxifolia var. lutchuensis. It is probably best considered a separate species as it has a distinct DNA profile clearly different from J. taxifolia.