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The intercomparison of personal dose equivalent (H p (10)) among nine economies was carried out at 27 Individual Monitoring Service (IMS) Laboratories in Southeast and East Asia in 2023. In this programme, a whole-body dose assessment from Cs-137 and N-80 X-rays with two different incident beam angles (0 deg and 30 deg) was performed using an Optically Stimulated Luminescence (OSL) dosimeter. The trumpet curve recommended by IAEA GSG-7 was used as the criterion of acceptance value. The results showed that 95% of all data were within the acceptable value, with 13 items of data from two laboratories being unacceptable. After the intercomparison programme was concluded, these two laboratories implemented system improvement, including reader performance checks, calibration, configuration adjustment, and dose evaluation method enhancement. The results after improvement fell within the acceptable limit, indicating successful system enhancement. This study contributes to the harmonisation of individual monitoring service laboratories in Southeast and East Asia, ensuring that measurement results are traceable to the International System of Units (SI). Each laboratory fulfils the performance standard requirements to ensure the validity of the results for the individual monitoring service laboratory. Moreover, the complementary study induced by this exercise indicates the necessity of the intercomparison programme and successful outcome of the system improvement. • Personal dose equivalent measurement using OSL dosimeter. • Competency testing between individual Monitoring Service laboratories. • Harmonisation of personal dose assessment in the region. [ABSTRACT FROM AUTHOR]