Castle to JAG
6 connections
Castle
Law & Order
Hudson University from L&O also appears as the home of various victims and crimes in Castle,
Arrow
Hudson University is the fictional University where many Law & Order characters graduated as well as the location of F.I.R.E.S.T.O.R.M. On Arrow
Hawaii Five-O (2010)
Hawaii Five-O references Dominic Alonzo from Arrow
NCIS: LA
NCIS: LA and Hawaii Five-O worked together in a crossover episode to stop a smallpox outbreak
NCIS
NCIS: LA was a spinoff of NCIS
JAG
NCIS was a spinoff of JAG