Nootka Cypress (Callitropsis nootkatensis), formerly Cupressus nootkatensis, Xanthocyparis nootkatensis or Chamaecyparis nootkatensis, is a cypress (Cupressaceae) with a chequered taxonomic and nomenclatural history.

First described in the genus Cupressus as Cupressus nootkatensis in 1824, it was transferred to Chamaecyparis in 1841 on the basis of its foliage being in flattened sprays, as in other Chamaecyparis, but unlike most (though not all) other Cupressus species.

However, this placement does not fit with the morphology and phenology of the cones, which are far more like Cupressus, like them maturing in two years, not one. Genetic evidence, published by Gadek et al. (2000), strongly supported its return to Cupressus and exclusion from Chamaecyparis.