The purpose of this paper is to discuss international and transnational ideas and movements on women policing in the early twentieth century. The argument is that even as the history of women policing has not been overlooked it certainly has had a too narrowly national view. In Great Britain it was the First World War that brought women into policing. As men were called into military service there soon was a shortage of police officers. This need was partially met by several volunteer organizations of women police. Towards the end of the war some parts of these voluntary women police organizations were formalized. Women policing became a part of the British police from that moment on. Women policing was not something entirely new though. Across the Atlantic women policing had become a reality in the United States already in the late nineteenth century and even more so during the early twentieth century. In Sweden the first women in the police were hired as early as 1908. It is not a coincidence that women policing was established on both sides of the Atlantic in the early twentieth century. The aim of this paper is to discuss the growth of the internationally and transnationally developing so called "police women's movement" in the early twentieth century.