Instrument introducers are disclosed which facilitate the insertion of a surgical instrument into a cavity or a body of a patient. In one embodiment, the instrument introducer includes a hollow elongate cylindrical body including a distal end portion terminating in a distal edge and a proximal end portion, the cylindrical body defining a central longitudinal axis, and an elastomeric cap secured to the distal end portion of the cylindrical body, the cap including a distal end wall having an outer terminal edge and an annular side wall depending from the outer terminal edge thereof. The distal end wall includes an aperture formed therein, wherein a center of the aperture is coaxially aligned with the central longitudinal axis.