ABSTRAK Telah dilakukan penelitian metode magnetik gradiometer untuk pemetaan sebaran objek-objek arkeologi yang terpendam di komplek Masjid Tuha Indrapuri Aceh Besar. Pengukuran medan magnetik total dan gradiometer di lapangan dilakukan dalam bentuk grid dengan spasi antar-titik 2 m meliputi area seluas 15395,27 m^2. Untuk memperoleh anomali medan magnetik total yang berasal dari benda target, telah dilakukan koreksi diurnal dan IGRF (International Geomagnetic Reference Field) terhadap data yang terukur. Untuk memudahkan interpretasi kualitatif, data anomali medan magnetik total telah ditransformasi reduksi ke ekuator, low pass filter dan high pass filter. Peta kontur anomali medan magnetik total yang telah di reduksi ke ekuator, pemfilteran dan medan magnetik gradiometer dibandingkan sehingga didapat gambaran bawah permukaan daerah penelitian. Semua peta kontur menunjukkan adanya pola-pola kelurusan anomali medan magnetik di sekitar masjid yang diinterprerasikan sebagai sisa-sisa bangunan atau objek-objek arkeologi di bawah permukaan. Kata kunci: Gradiometer, metode magnetik, anomali medan magnetik total, geofisika arkeologi ABSTRACT A research using magnetic and gradiometer methods have been conducted for mapping distribution of archeological objects buried in Masjid Tuha Indrapuri, District of Aceh Besar. In order to obtain a better resolution of the targets, the total magnetic field and gradiometer data were measured with 2 m distance between stations, covering an area of 15395.27 m^2. The diurnal and IGRF (International Geomagnetic Reference Field) correction were used to obtain the total magnetic field anomaly. The total magnetic field anomaly data have been analyzed with reduction to the equator transformation, low pass filter and high pass filter. The reduction to equator, low pass filter and high pass filter of the total magnetic field anomalies as well as the gradiometers data were compared. The maps show alignment of contour patterns around the mosque expected as structures and archeological objects in the subsurface. Keywords: Gradiometer, magnetic methods, total magnetic field anomaly, archaeology geophysics