This study investigates the effectiveness of career-group counseling program in developing job interview skills among Job Seekers in the Sultanate of Oman. The study sample consisted of (300) male and female job seekers. Forty of this sample were identified as weak in interview skills. Those were divided into two groups: experimental (n=20) and control (n = 20). The experimental group underwent a group guidance program, while the control group did not receive any treatment. The study followed a semi-experimental approach. The scale of developing the career interview skills was administered to the sample, after verifying its psychometric properties. The scale consisted of 30 items distributed to three dimensions: preparation for the interview, personal skills, and thinking skills. The stability coefficient of the scale was 0.90. The results of MANCOVA analysis showed that there were statistically significant differences in the post-measurement between the control group and the experimental group in favor of the experimental group. The effect coefficient (eta squared) was 0.74. The results also showed that there were no differences between male and female in interviewing skills, and there was no interaction between gender and treatment. The results of the ANOVA Repeated-measure revealed statistically significant differences between the pre-test and post-test of the experimental group in favor of post-measurement. The results showed no statistically significant differences between the post-measurement and the follow-up measurement, indicating the effectiveness of the program persists. The results were discussed and interpreted in light of previous research. The study concluded with a set of recommendations and suggestions.