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| Morrigan | |
| Aliases: | Morrigan; Siryn; Banshee; Terry Cassidy; Theresa Rourke; Theresa Rourke Cassidy; Theresa Maeve Rourke Cassidy |
| Continuity: | Marvel Universe |
| Notability: | Supporting character |
| Type: | Superhero |
| Gender: | Female |
| Race: | Mutant |
| Location: | Cassidy Keep, County Mayo, Ireland New York City, New York Mutant Research Center, Muir Island, Scotland |
| Associations: | X-Factor Investigations X-Corporation X-Force Fallen Angels |
| Relatives: | Sean Cassidy Maeve Rourke Cassidy Tom Cassidy Sean Madrox |
| First: | Spider-Woman, Vol. 1 #37 |
| Actor: | Shauna Kain |
Theresa Maeve Rourke Cassidy is a fictional superhero who has gone by several code names including Siryn and Banshee. She is featured in comic book titles published by Marvel Comics and is associated with the X-Men line of titles. She first appeared as Siryn in Spider-Woman, Volume 1 #37 in April, 1981. She adopted her late father's former code-name Banshee in X-Factor, Volume 1 #200 in February, 2010. She then took on the alias of Morrigan, which she began using in X-Factor #244 in November, 2012.