The cable lock has a flexible cable portion and an elongated lock body at one end of the cable portion which is enclosed by a two-part synthetic plastics casing. The plastics casing comprises a cap-shaped outercasing part which substantially completely encloses an inner casing part which fixes the lock body in its longitudinal direction. The inner casing part carries a tubular projection which together with the cable portion passes through an aperture in an end wall of the outer casing part. The inner edge of the aperture is fitted by snap-action in an annular groove in the tubular projection. The synthetic plastics casing of the cable lock is mechanically rugged and its snap-action joint is visually unobtrusive.