We studied iron-hydrogen (Fe-H) complexes in Si by EPR measurements. Specimens prepared from an n-type FZ-Si crystal (phosphorus concentration: 1X10(16)cm(-3)) were doped with Fe and H by heating in Fe vapor and H-2 gas, respectively. EPR spectra were measured with use of an X-band and a Q-band spectrometer. New EPR absorption spectra were observed at around 2.067 of g-value. We identified them to be due to Fe-H pair from the EPR spectrum, the isotope effect of hydrogen and thermal stability. To explain a peculiar dependence of EPR spectrum on the measurement frequencies (X-band and Q-band), we propose that the H atom in Fe-H pair moves around the Fe atom by tunneling.