- right cancellative groupoid
- right cancellative semigroup
- right chain ring
- right circular cone
- right circular cylinder
- right closed martingale
- right coherent ring
- right comaximal elements
- right commutator
- right compatibility
- right compatible relation
- right complete category
- right completion
- right composition algebra
- right condition
- right cone
- right congruence
- right congruent element
- right conoid
- right continuity
- right-continuous
- right-continuous function
- right-continuous process
- right-continuous with left limits
- right coprime elements