Abstract: A collapsible splash guard is provided which is adapted to be mounted in a toilet, and which is constructed for movement between an extended operative position when the toilet seat is in a raised position and a collapsed storage position when the seat is in a lowered position. The splash guard comprises a plurality of segments assembled in nested relation with one another and normally arranged in a collapsed storage position within the bowl of the toilet when the seat of the toilet is in the lowered position. The innermost of the nested segments is connected to the toilet seat in such a manner that when the toilet seat is lifted to the raised position, the innermost segment is lifted upwardly from within the bowl and the nested segments are moved with respect to one another from a nested relationship into an extended overlapping relationship positioned above the toilet bowl and forming an enclosure shieldingly surrounding the back and side portions of the bowl.