This study investigated the dietary behaviors and consumption of convenience foods among salaried men in Busan, Korea, and compared them based on the men’s nutritional knowledge level. A questionnaire was developed based on the review of literatures and was distributed to 250 office workers in Busan in February 2013. A total of 224 data were used for the analyses. χ²-tests were employed for the nominal data while Mann-Whitney’ U-tests were used for the ordinal data. Leven’s tests were first performed before the t-tests for the interval data. Almost 60% of the respondents were female, 50% were in their 30s and 68% lived with other family members. The mean score of the nutritional knowledge test was 13.78 out of 20. Women and those who graduated from college or higher were likely to get a better score than men and those who graduated from high school or below. The respondents were divided into two groups for further analyses: Low (LK) vs. High (HK) knowledge score groups. LKs were more likely to consume 20 convenience foods than HKs. Although the respondents recognized the nutritional disadvantages of consuming convenience foods for an extended period, they continue to eat them because they lack time and further, it is quick and easy to consume convenience foods instead of preparing meals from scratch.