Abstract: A marker holster includes an elongate tubular housing and a fastening member attached to the housing for removably securing the housing to an article. The housing has an upper end defining a marker opening and an opposed end. A generally open interior space extends between the marker opening and the opposed end for receiving a capped or uncapped marker. An inner surface of the housing defines an elongate slot and a locking chamber in communication with the elongate slot for selectively retaining the marker's cap in the housing, and thereby holding the attached marker. The marker may be removed from the retained marker cap and the holster by pulling the marker upwardly. A surrogate cap is nested in the housing proximate the opposed end for selectively receiving the uncapped marker's writing tip, and thereby clutching the marker. The marker may be removed from the holster by pulling the marker upwardly.