Archibald Menzies (March 15, 1754 - February 15, 1852) was a Scottish physician and naturalist.

Menzies was born in Perthshire. He studied botany and medicine in Edinburgh, and later became assistant to a surgeon in Caernarvon. He joined the Royal Navy and served on the Halifax Station in Nova Scotia.

Menzies (pronounced Ming-ess) was appointed surgeon on board HMS Prince of Wales, which was travelling round Cape Horn to the northern Pacific. He collected a number of new plants on this voyage, and also ensured that none of the crew died of illness.

In 1790 Menzies was appointed as naturalist to accompany George Vancouver on his voyage around the world on HMS Discovery. When the surgeon fell ill Menzies took over his duties, and again not one man died of ill health.

After the voyage Menzies served with the Navy in the West Indies. He received the degree of M.D. at Aberdeen University in 1799. After retiring from the Navy he became a doctor and surgeon at Notting Hill, London.

His name is commemorated in the scientific names of several of the plants he discovered, including Menziesia, a genus of shrubs in the Ericaceae, and the Douglas-fir Pseudotsuga menziesii, the most important tree in western North America.