Relation
- Binary relation
- Coefficient of relationship
- Constituent (linguistics)
- Directed relation
- Equivalence relation
- Grammatical relation
- Homogeneous relation
- International relations
- Interpersonal relationship
- Kinship
- Public relations
- Reflexive relation
- Relate (disambiguation)
- Relation (database)
- Relation (mathematics)
- Relation (philosophy)
- Relation algebra
- Relation aller Fürnemmen und gedenckwürdigen Historien
- Relational algebra
- Relational calculus
- Relational database
- Relational model
- Relational theory
- Relationism (disambiguation)
- Relations (album)
- Relationship (disambiguation)
- Relative (disambiguation)
- Relativism
- Relativity (disambiguation)
- Serial relation
- Social relation
- Ternary relation
- Toshio Matsumoto