Measurement data for Indoor Positioning study is collected at a 4m×5m test bed, which was set up at Kadir Has University, Istanbul, Turkey. Four wireless access points are used during data collection which are located at corners of the test bed. Markers are placed at every 50 cm and measurements are done on the grid shown at the TEST BED.jpg file. A second data is collected at 4.95m×9.45m sized test bed, which is set up in different location at KadirHas University, Istanbul. Wireless access points are located around the corners of the test beds and markers are placed at every 45 cm. RSSI measurements are stored via NetSurveyor program running on a Lenovo Ideapad FLEX 4laptop, which has an Intel Dual Band Wireless-AC 8260 Wi-Fi adaptor. Raw measurement data are stored as xml format and process at MATLAB for simulations. Data can be used especially for indoor positioning estimation studies.