Abstract: The general objectives of the study were to determine the influence of financial reporting instruments on the financial performance of environmental conservation NGOs at Nairobi City County, Kenya. The specific objectives were to establish the influence of financial reporting instruments disclosure, financial reporting instruments presentation and financial reporting instruments recognition and measurement on the financial performance of environmental conservation NGOs at Nairobi City County in Kenya.Questionnaires as primary data collection tools and secondary data sheet for secondary data collection were used in data collection process and the data collected was analyzed using Multiple regression analysis (standard), descriptive analysis (means and standard deviations) and inferential statistics.