- common perilla
- common perpendicular
- common plane
- common platform of geographic information
- common poinsettia
- common point
- common polytrichum
- common pool resources
- common portland cement
- common preparation
- common primary glomerulonephritis
- Common Program of Chinese People's Political Consultative Conference
- Common Program of the Chinese People's Political Consultative Conference (Ethnic Policy Section)
- common proper motion
- common proper-motion binary
- common proper-motion pair
- common proper-motion stars
- common property of mankind
- common prosperity
- common quail
- common ragweed
- common rail system
- common ratio
- common reed
- common refinement