The diploma thesis entitled "Strategic Planning and Internationalization of Born-Global Companies on the Example of Textile Industry" presents the fundamental determinants of strategy formation and international business of globally born companies, states and explains the tools for shaping business strategy, determines the effectiveness of strategy application on the example of the textile industry. The mentioned factors that influence the creation of born-global companies include global vision, innovation, a strong international resource base, technological development, business networks, an aggressive learning style and risk tolerance. The barriers to internationalization most often mentioned are financial and resource constraints, administrative difficulties, laws and regulations, unfamiliarity with foreign markets, lack of managerial skills, and economies of scale. Among the methods of internationalization of companies described in the paper, i.e. the ways in which companies can enter the international market, in addition to export, franchise and licensing as contractual methods, wholly owned subsidiaries (FDI) and joint ventures are included. When analyzing the company's operations, depending on whether the internal or external business environment is analyzed, tools such as SWOT analysis, PESTLE analysis, Porter's 5 forces analysis, VRIO model analysis and value chain analysis are used. After the theoretical considerations of internationalization, in the second part of the thesis, an example of strategy is given on the example of the textile industry, namely the company Zara (Inditex). It is shown how this international company built its current position on the market through creation of its competitive advantage and the strategy by which the company achieved profitable business in the observed period was analyzed.