This descriptive study illustrated the proportion of EGFR mutation in non-small cell lung cancer (NSCLC) at “Dharmais” National Cancer Hospital. Examination of EGFR mutation started in 2015, 196 data was collected and 68 data being analyses. Fixed Formalin Paraffin Embedded (FFPE) processed by cobas® 4800 real time polymerase chain reaction. The results shown 34% patients NSCLC with EGFR mutation and all of them was single mutation. EGFR mutation happens in Exon 21 L858R 10 cases (44 %), Exon 19del 12 cases (52 %) and the type of Exon 20 S768I 1 case (4 %). This study found a high proportion of EGFR mutation.