The aim of the present study was to examine the association of physical activity levels in the third trimester with the birth anxiety. This research was of a correlation kind and was conducted through field research. The population in this study were women who were 9 months pregnant and have attended Imam Hussein Hospital in Shahrood to give birth to their children. The sample size was 76 people. To gather information to determine the level of physical activity PPAQ and to determine the level of anxiety (STAI) Spielberger’s Questionnaire were used. Validity of all methods was examined by researchers and experts in the field and their reliability using Cronbach\'s alpha, respectively (0.81, 0.71). For data analysis SPSS Software Version 16 was used and to test the research hypothesis the Kolmogorov- Smironov test, Pearson and Spearman correlation coefficients were used. Findings show that there is significant inverse relationship between the level of physical activity and birth anxiety at the time of delivery (P<0.05). but there is not a significant relationship between activity at work and footwork with birth anxiety (P>0.05). According to research findings it is suggested that pregnant women in the third trimester exercise activities at home lightly and do not stop them until the labor, to feel less anxious.

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