The selenium content in the five lyophilised reconstructed Polish diets were determined with two analytical methods: fluorimetric method and method of radiochemical neutron activation analysis (RNAA). The results obtained with the RNAA method were lower than those obtained with the fluorimetric method, although the differences were statistically not significant. The mean selenium content in lyophilised samples determined with RNAA method ranged from 0.048±0.003 mg/kg to 0.061±0.002 mg/kg. The results obtained with fluorimetric method ranged from 0.057±0.004 mg/kg to 0.072±0.003 mg/kg. Considering diet mass after reconstruction and dry mass content in diets before and after lyophilisation, the content of selenium was calculated in the daily diets. The mean selenium daily uptake calculated from RNAA results was from 19.02 μg to 27.33 μg. The mean selenium content in diets calculated on the basis of fluorimetric determinations was from 22.10 μg to 32.78 μg. The results indicated that the selenium content in Polish diets was relatively low. The coverage of the recommended intake of selenium varied from 40% to 70%, depending on the type of the household.