Abstract: A strap buckle having male and female components which are connected to respective opposite ends of a strap and which have cooperative and releasable latching means whereby the two components are releasably held against separation. The strap is connected to the male component through connecting means arranged to permit adjustment of the effective length of the strap so that the strap can be extended or shortened as required, and in use that connecting means normally locks the strap against extension. The female component includes a strap reacting section which overlies the connecting means of the male component when the two components are connected together and thereby prevents the strap from being manipulated such as to release it from the locking influence of the connecting means. The male component has three laterally spaced arms which locate within the female component, and guard means is provided on one or more of those arms to prevent incorrect or incomplete cooperation of the two components.