The Faculty of Science was established with the creation of the University of Girona through the agreement with the Catalan Parliament published in the Official Gazette on 31 December 1991. Prior to this, Girona relied on the Universitat Autònoma de Barcelona, which started in 1970 with 98 students. In 1972 this delegation was recognised as the Science Department of the Collegi Universitari de Girona, which was integrated into the Universitat Autònoma de Barcelona in 1982 with 207 students and 27 teaching staff. In 1989 the creation of Estudi de Ciències science department was approved within the framework of the Estudi General de Girona. During 1989-1990, there were 418 enrolled students and pre-EHEA Biology and Chemistry degrees were taught. It was these pre-EHEA degrees that were being taught when the University of Girona was created in 1991. A little later, in 1993, Environmental Science courses were introduced. Biology, Environmental Science and Chemistry are the three subjects taught at present to over a thousand students enrolled in the Faculty, but the Faculty of Science is also the headquarters of several postgraduate studies and houses research units from four departments of the UdG (Biology, Environmental Science, Chemical Engineering, Agriculture and Agricultural and Chemical Technology).
The Faculty initially used the rooms that the Science Department of the Estudi General de Girona occupied in the Casa de Cultura, later expanding to other locations in Albereda street (Fórum building) in Girona city centre. In February 1997 it moved to new headquarters on the Montilivi Campus, the location of the Faculty to this day.
The first dean of the Faculty of Science was Dr Lluís Polo, who was nominated as Chair of the University Management Commission in 1992. At that time the Faculty called itself the Faculty of Experimental and Health Sciences. As Faculty of Experimental Sciences, the first elections for dean were won by Josep Enric Llebot, who was later replaced by Dr Carles Pla. The Faculty adopted its definitive name: The Faculty of Science. Dr David Brusi was dean during the transfer to the current headquarters on the Montilivi Campus and until October 2003. After a brief transition period in which Dr Joan Miró and Dr Margarida Casadevall served as acting deans, Dr Manel Poch was chosen as dean. Later, from 2006 until 2008, Dr Crisanto Gómez and Dr Juan M. Sánchez occupied the post of dean. Dr Victòria Salvadó was elected for two terms as dean, from 2008 until December 2016, when Dr Jesús Colprim took over.