A friction spinning apparatus comprises two rollers (1, 2) in closely spaced parallel arrangement which define between them a yarn formation zone at an elongate gap along the rollers and a feed duct (41') which extends into the gap so as to feed fibres directly into the gap in such a manner that they can fall directly onto the yarn (419). The feed duct comprises two parts (415, 416) one (415) of which includes a planar portion defining a side wall of the fibre feed passage along the duct and the other (416) of which is a complex part defining the opposite side wall as well as end walls which in the assembled fibre feed duct extend between the opposite side walls.