MAGNETIC induction caused by sea characteristics has recently been the focus of attention of several studies. Since water is an electrically conductive liquid, its movement in the Earth's MAGNETIC field produces a transverse MAGNETIC force at each unit of charge. Therefore, it seems essential to identify the factors affecting the fluctuations of these MAGNETIC fields and the effect of these factors on the marine, navy, and military applications. In this research, the changes of MAGNETIC fields caused by sea WAVES in the Strait of Hormuz have been investigated. For this purpose, we use the WAVES parameters obtained from numerical model of MIKE21, and then, calculate the MAGNETIC field and observe the MAGNETIC field fluctuations in the study region. The results show that the values of MAGNETIC field vary between 0 and 0. 2 nanotesla. Moreover, MAGNETIC field values in Bandar Abbas coast and Iran shoreline within the study region are less than the MAGNETIC field values in the Islands of Qeshm, Hormuz and Larak. In general, it can be said that the MAGNETIC field fluctuations are completely caused by changes in the WAVES parameters so that the trend and pattern of changes of three variables of the WAVES including height, period, and MAGNETIC field within the study region are almost the same. Therefore, due to the low height and low period of the WAVES in the Strait of Hormuz, the MAGNETIC field caused by the WAVES is not considerable, and thus, its effect on MAGNETIC field fluctuations is not also noticeable. As a result, in some maritime applications, like determination of the range of MAGNETIC field fluctuations for the purpose of setting sensors of a torpedo and preventing the torpedo deviation from the goal, the effect of WAVES on the MAGNETIC field fluctuations can be ignored.