Cut-off low are synoptic-scale low pressure systems formed as a result of meridional shifts of the jet streams. The characteristics of Cut-off Lows in Iran are studied for the period 1976–2015. To dentify these systems, the Raul Nitog algorithm was used with automatic detection capabilities. The systematic identification of Cut-off Lows is realized by applying an original automated scheme using mean daily geopotential height, U wind and air temperature at 500 hPa NCEP Reanalysis data. In this study, a total of six pattern types were identified for cutoff lows which will be reviewed below.These patterns are as follows: Eastern arm of Omega, western arm of Omega, Inverted Omega, Rex pattern, S pattern, Dipole pattern. According to the results the eastern arm of Omega pattern has the highest frequency with 374 days (26 %). The Inverted Omega pattern with 330 days (23 %) is in the next rank. After these two patterns, the Rex pattern with 296 days of cutoff low (20.6 %) ranks third, while the dipole patterns with 181 days (12.6 %), the S model with 135 days (9.4 %) and finally the western arm of Omega pattern with 120 days (8.4 %) are in further ranks. It was also found that the highest percentage of precipitation of more than 100 mm of cut-off lows was related to the omega eastern arm pattern.