A relationship is a specific connection between objects, entities or concepts. Typical forms of relationship are social relationships between people, causal relationships between events, and mathematical or theoretical relationships between components of a modelled system.

Relationship may refer to:

• Interpersonal relationship and intimate relationship, including relationships based on Romantic love
  • List of basic relationship topics
• Relation (mathematics), including:
  • Direct relationship
  • Inverse relationship
• Causality, the relationship between cause and effect
• Relational model, a database model based on predicate logic and set theory
• Customer relationship management, the management of thee relationship between a supplier and its customers