The impact of this BANSOS data governance problem is that the data collection of residents receiving social assistance is not objective and not on target, so that the target of reducing poverty in South Lampung Regency is not achieved and the elimination of extreme poverty is not achieved. This study aims to evaluate the level of maturity in managing BANSOS data sourced from the South Lampung Regency APBD using the Data Governance Domain in the DAMA-DMBOK framework and identify gaps between existing performance and expectations related to the level of importance using GAP Analysis. Based on the measurement of the maturity level of BANSOS data governance in the work environment of the South Lampung Regency Regional Government, it is at Level 3 or Defined Level. These results are reinforced by the results of the GAP analysis which shows that there is a significant gap between the implementation of BANSOS data governance as perceived by OPD and OPD's expectations of the implementation of BANSOS data governance, so the results of this study recommend the implementation of BANSOS data governance in the South Lampung Regency Regional Government based on DAMA-DMBOK as a comprehensive data governance guide that includes several roles in data governance such as the application of Data Architect which acts as an indicator of data structure preparation and Data Analyst which acts as an indicator of data visualization in helping decision making.