Cisgender (IPA: /ˈsɪsdʒɛndə˞/) is an adjective used in the context of gender issues and counselling to refer to a type of gender identity formed by a match between an individual's biological sex and the behavior or role considered appropriate for one's sex. In some feminist organizations, cisgender has come to mean, "A gender identity formed by a match between your biological sex and your subconscious sex." 
Cisgender exists in contrast to transgender on the gender spectrum.
The word has its origin in the Latin-derived prefix cis, meaning "on the same side" as in the cis-trans distinction in chemistry. In this case, "cis" refers to the unity of a gender identity with a biological gender assignment.
The word cisgender has been used on the internet since at least 1994, when it appeared in the alt.transgendered usenet group in a post by Dana Leland Defosse. Defosse does not define the term and seems to assume that readers are already familiar with it. Coinage has been attributed to Carl Buijs, a transsexual man from the Netherlands, in a number of internet publications. which suggest that he proposed the term in 1995. It may have been independently coined; in April 1996, Buijs said in a usenet posting "As for the origin; I just made it up".
The term has more recently been used in scholarly publications, such as a 2006 article in the Journal of Lesbian Studies and Julia Serano's 2007 publication Whipping Girl. Serano also uses the related terms cissexual, which she defines as "people who are not transsexual and who have only ever experienced their subconscious and physical sexes as being aligned" (p. 12), and cissexism, "which is the belief that transsexuals' identified genders are inferior to, or less authentic than, those of cissexuals."
- Crethar, H. C. & Vargas, L. A. (2007). Multicultural intricacies in professional counseling. In J. Gregoire & C. Jungers (Eds.), The counselor’s companion: What every beginning counselor needs to know. Mahwah, NJ: Lawrence Erlbaum. ISBN 0805856846. p.61.
- Helen G (2008-03-17). The F-Word's Trans 101. Published on thefword.org.uk/. Retrieved on 2008-03-17.
- Dana Leland Defosse (1994-05-26). Transgender Research. Posted on alt.transgendered newsgroup. Retrieved on 2007-12-22.
- Donna Lynn Matthews (May 1999). Definitions. Donna's Hideout. Retrieved on 2007-12-22.
- Emi Koyama (06/07/2002). Cissexual/Cisgender: decentralizing the dominant group. Published on eminism.org. Also posted on WMST-L, an international e-mail forum for discussion of Women's Studies teaching, research, and program administration. Retrieved on 2007-12-22.
- Carl Buijs (1996-04-16). A new perspective on an old topic. Posted on soc.support.transgendered newsgroup. Retrieved on 2007-12-22.
- Green, Eli R. (2006). "Debating Trans Inclusion in the Feminist Movement: A Trans-Positive Analysis", Journal of Lesbian Studies. Volume: 10 Issue: 1/2. pp. 231 - 248. ISSN 1089-4160
- Serano, Julia (2007), Whipping Girl: A Transsexual Woman on Sexism and the Scapegoating of Femininity, Seal Press, 2007. ISBN-13 978-1-58005-154-5, ISBN 1-58005-154-5
- Serano (2007) also defines cisgender as synonymous with "non-transgender" and cissexual with "non-transsexual". (p. 33)
- Transsexual Roadmap Transgendered Glossary. 1996-2005, retrieved 24 November, 2005.
- Gorton R, Buth J, and Spade D. Medical Therapy and Health Maintenance for Transgender Men: A Guide For Health Care Providers Lyon-Martin Women's Health Services. San Francisco, CA. 2005. p (10,22) ISBN 0-9773250-0-8
- Green, Eli R. (2006). Debating Trans Inclusion in the Feminist Movement: A Trans-Positive Analysis, Journal of Lesbian Studies. Volume: 10 Issue: 1/2. pp. 231 - 248. ISSN 1089-4160 Article abstract.
- Dean of Students Transgender FAQ. University of Texas at Austin.
- From Metrosexual to the Uber-Complex: Multiple Identities of Gender and Sexuality Intersections of Identity conference. Rutgers, the State University of New Jersey. Paul Robeson Campus Center
- Fausto-Sterling, A. (2000). Sexing the Body New York: Basic Books.