Purpose: The critical bandwidth represents response interactions with respect to a reference tone and neighboring spectral bands. The aim of this study was to analyze the critical bandwidths of a 1,000 Hz tone in Korean young male and female subjects at a conversational level (60 dB HL). Methods: Critical bandwidths were measured in twenty subjects with the notched band noise method under the two alternative forced choice condition. Results: The average critical bandwidth of 1,000 Hz was 175.23 Hz, which was slightly greater than the previous Western measures. There were no statistically significant differences in gender, nor were there any significant differences in lateralization of the ear (p > 0.05). Conclusion: Critical bandwidth measures can produce valuable response profiles for reference tones and adjacent frequency bands. This information will be beneficial in improving Korean speech communication under various acoustic conditions.