Obsessive Relational Intrusion (ORI) is a term used in criminal psychology research used to describe the willful and continued intrusion into the personal life of a victim by an aspiring or former relational partner. ORI is related to stalking in that it is a milder form of relational harassment, often lacking the characteristic threatening and aggressive behavior normally associated with stalking. Cupach and Spitzberg Template:Harv have defined it as "repeated and unwanted pursuit and invasion of one’s sense of physical or symbolic privacy by another person, either stranger or acquaintance, who desires and/or presumes an intimate relationship."
- Cupach, W. R.; Spitzberg, B. H. (1998), Obsessive relational intrusion and stalking. In B. H. Spitzberg & W. R. Cupach (Eds.), The dark side of close relationships, Lawrence Erlbaum, pp. 233-263
- Frieze, I. H. (2005), "When courtship persistence becomes intrusive pursuit: comparing rejecter and pursuer perspectives of unrequited attraction", Sex Roles: A Journal of Research 52 (11-12): 839-852