A lubricant insert (12) for lubricating rolling bearings (10) composed of a firm, tough, solid gel matrix containing a lubricating oil of lubricating viscosity which exudes therefrom to provide an oily surface in contact with the elements (22) of the bearing (10). The preferred form of lubricant insert (12) comprises an annular member (30) having a plurality of circumferentially spaced axially directed projections (32, 34) which have surfaces conforming to the contour of the rolling elements (22) and which are of a predetermined orientation to permit ease of assembly and locking of the insert (12) in place in the annular space between the inner and outer rings (14, 16 resp.) of the bearing (10).