The 4th International Congress on Biophotonics (ICOB 2015) will be the comprehensive event for the community worldwide. From medical and biological end users to decision makers from industry, ICOB 2015 addresses the different groups in Biophotonics with custom-tailored sessions. Apart from biomedical challenges and cutting-edge Biophotonics research, topics at ICOB 2015 will also cover the framework conditions like education and funding. By bringing together the whole spectrum of experts in Biophotonics ICOB 2015 will take interdisciplinary networking to the next level and provide key individuals with what is necessary to increase success in the field. ICOB 2015 is organized by the European Laboratory for Non Linear Spectroscopy and Leibniz Institute of Photonic Technology in cooperation with COST Action BM 1401 Raman4Clinics under the patronage of the Florence Municipality.