The current state of the national economy determines the importance of increasing its efficiency and competitiveness. Entrepreneurial activity is one of the most active forms of activity in the economic sphere. The development of entrepreneurship in Ukraine is one of the main issues of today. The degree of significance of the role of entrepreneurial activity in the development of the national economy and in solving problems aimed at the formation of an efficient and competitive economy under risk and uncertainty has been studied. The types and functions of entrepreneurship are analysed. It is noted that they are the main elements in solving the main problems hindering the development of an effective national economy. Since February 24, 2022, due to the full-scale military aggression of russia, the domestic economy has been subjected to another negative impact, in addition to those that have been in effect over the past decade. The armed conflict in the east of Ukraine in 2014, the covid-19 pandemic in 2019 and the next wave associated with the SARS-CoV-2 Omicron virus in 2021 have already led to a violation of the economic and political stability of our state. Currently, due to the destruction of industrial and civil infrastructure, we are witnessing the processes of forced displacement of people and, as a result, the loss of labour, a decrease in the share of taxes paid and an increase in the cost of maintaining the life of the country. National entrepreneurship in the conditions of the war unleashed by Russia is characterized by a quick ability to adapt to unpredictable conditions, a high level of organizational and technical mobility, and a high level of riskiness of entrepreneurs. All this makes it possible to introduce innovations at a rapid pace, to quickly and efficiently complete the program of relocation of enterprises and resume their efficient operation. It was entrepreneurship that did not allow the national economy to be in a crisis situation. The authors note that a key role in this process was played by the ability of Ukrainian entrepreneurs to make atypical decisions, which allowed them to change their profile, in particular, change the direction of their activities in the conditions of war. According to the State Statistics Service and the European Business Association, the dynamics of growth in the number of individual entrepreneurs in 2022 was analysed. Nowadays, the experience of developed countries can become an impetus for the formation of a new Ukrainian economy, the creation of an economically comfortable and stable competitive environment and the identification of the main success factors for the activities of business entities, in particular small and medium-sized enterprises, which are key in the economic development of the country.