The invention relates to the soybean variety designated XR09AP15X. Provided bytheinvention are the seeds, plants and derivatives of the soybean varietyXR09AP15X. Alsoprovided by the invention are tissue cultures of the soybean variety XR09AP15Xand the plantsregenerated therefrom. Still further provided by the invention are methods forproducingsoybean plants by crossing the soybean variety XR09AP15X with itself oranother soybeanvariety and plants produced by such methods.