Lawson's cypress (Chamaecyparis lawsoniana), is an evergreen coniferous tree in the genus Chamaecyparis, Family Cupressaceae. It is also known as Port Orford cypress or "Port Orford cedar" (confusing, because it is a cypress, not a cedar). It is native to the southwest of Oregon and the far northwest of California in the U.S.A It was first discovered near Port Orford in Oregon and introduced into cultivation in 1854, by collectors working for the Lawson & Son nursery in Edinburgh, Scotland.

It is a large tree, regularly reaching 60 m (200 ft) tall, with feathery foliage in flat sprays, usually somewhat glaucous blue-green in colour. The leaves are scale-like, 3-5 mm long, and produced on somewhat flattened shoots. The cones are globose, 7-14 mm diameter, with 6-10 scales.

It is of great importance in horticulture, with several hundred named cultivars of varying crown shape, growth rates and foliage colour having been selected for garden planting.