- regular polyhedral group
- regular polyhedron
- regular polyhedron group
- regular polymer
- regular polytope
- regular position
- regular power series
- regular precession
- regular premium
- regular prime
- regular prime number
- regular prism
- regular problem
- regular process
- regular product
- regular projective transformation
- regular pyramid
- regular quadratic form
- regular quadratic space
- regular quadric hypersurface
- regular quotient object
- regular ramification point
- regular random process
- regular rational function
- regular rational mapping