Mills, R. (2021). Recognizing Wilgefortis. In LaFleur, G., Raskolnikov, M., Kłosowska, A.M. (Eds.), Trans Historical: Gender Plurality Before the Modern. (pp. 133-159). Ithaca: Cornell University Press.
Mills, R. (2021). Wild Forms: The Art of East Anglian Wodewoses. In Luxford, J. (Ed.), Tributes to Paul Binski. Medieval Gothic: Art, Architecture and Ideas. (pp. 162-173). London: Harvey Miller.
Mills, R. (2020). Derek Jarman's Library. In Kissane, S., Rehmani-White, K. (Eds.), Derek Jarman Protest!. (pp. 238-246). Dublin and London: Irish Museum of Modern Art; Thames & Hudson.
Mills, R. (2019). Saint Eugenia's Relics. In Brickell, C., Collard, J. (Eds.), Queer Objects. (pp. 236-243). Manchester: Manchester University Press.
Mills, R. (2013). Sovereignty. In Turner, M. (Ed.), A Handbook to Middle English Studies. (pp. 269-283). Oxford: Wiley-Blackwell.
Mills, R. (2013). Talking Heads, or, A Tale of Two Clerics. In Santing, C., Baert, B., Traninger, A. (Eds.), Disembodied Heads in Medieval and Early Modern Culture. (pp. 31-57). Leiden: Brill.
Mills, R., Campbell, E. (2012). Introduction: Rethinking Medieval Translation. In Campbell, E., Mills, R. (Eds.), Rethinking Medieval Translation: Ethics, Politics, Theory. (pp. 1-20). Cambridge: D. S. Brewer.
Mills, R. (2009). Atti, orientamenti e i sodomiti di San Gimignano. In Levy, A.M. (Ed.), Sesso nel Rinascimento: pratica, perversione e punizione nell'Italia rinascientale. (pp. 201-213). Florence: Le Lettere.
Mills, R. (2008). Monsters and Margins: Representing Difference. In Ayers, T. (Ed.), History of British Art, vol. 1: The Middle Ages, 600-1600. (pp. 203-225). London/New Haven: Tate/Yale Center for British Art.
Mills, R., Campbell, E. (2004). Introduction: Troubled Vision. In Campbell, E., Mills, R. (Eds.), Troubled Vision: Gender, Sexuality, and Sight in Medieval Text and Image. (pp. 1-14). New York: Palgrave Macmillan.
Mills, R. (2004). The Signification of the Tonsure. In Cullum, P.H., Lewis, K.J. (Eds.), Holiness and Masculinity in the Middle Ages. (pp. 109-126). Cardiff: University Of Wales Press.
Mills, R. (2003). Can the Virgin Martyr Speak?. In Bernau, A., Salih, S., Evans, R. (Eds.), Medieval Virginities. (pp. 187-213). Cardiff: University Of Wales Press.
Mills, R., Bildhauer, B. (2003). Introduction: Conceptualizing the Monstrous. In Bildhauer, B., Mills, R. (Eds.), The Monstrous Middle Ages. (pp. 1-27). Cardiff: University Of Wales Press.
Mills, R. (2003). Jesus as Monster. In Bildhauer, B., Mills, R. (Eds.), The Monstrous Middle Ages. (pp. 28-54). Cardiff: University Of Wales Press.
Mills, R. (2002). Ecce Homo. In Riches, S., Salih, S. (Eds.), Gender and Holiness: Men, Women and Saints in Late Medieval Europe. (pp. 152-173). London: Routledge.
Mills, R. (2000). Funeral Customs and Burial Rites. In Lindahl, C., McNamara, J., Lindow, J. (Eds.), Medieval Folklore: An Encyclopedia of
Myths, Legends, Tales, Beliefs and Customs. (pp. 390-398). Santa Barbara, USA: ABC-Clio.
Mills, R. (2000). Memento Mori. In Lindahl, C., McNamara, J., Lindow, J. (Eds.), Medieval Folklore: An Encyclopedia of
Myths, Legends, Tales, Beliefs and Customs. (pp. 650-654). Santa Barbara, USA: ABC-Clio.
Ashby, J., Ambrosio, C., Cain, J., Cuff, A., Ewen, M., Finn, M., ...Wade, S. (1900). Strange Creatures: The art of unknown animals. (No of pieces: 25). [Exhibition]. Grant Museum of Zoology, UCL.
Kutty, S., Mills, R. (1900). The Queer Tapestry. (No of pieces: 8). [Exhibition]. UCL North Cloister.