Knowledge is organizational value, it represent organizational core business. Knowledge embodies in human capital as organizational intangible asset. Acquiring organizational knowledge and the types of knowledge is important to identify existing core knowledge and requirement of knowledge. Human capital management concept began to be famous in Indonesian government since a new legislation of civil servant was released. UU ASN No. 5 Year 2014 transform civil servant management activities into human capital management based. It's affect to the three government institution duties and functions as human capital managers they are KEMENPAN & RB, BKN and LAN. Identifying organizational knowledge is important to create an effective collaboration and managing knowledge to enhanced organizational performance. Qualitative analysis is used to process the expert interview data. Content analysis used to codify the knowledge. Result show that 18 core knowledge were identify, which is classify into organizational core knowledge in each government human capital managers and some of them are intersect with others.