Financing of and investing in R&D are prone to risks of appropriation by competitors, information asymmetry, and agency problems. Although legal protection of intellectual property (IP) rights at the national level is necessary to encourage investing in R&D, we show that the effective enforcement at the local level is critical. We focus on the impact of provincial level IP rights enforcement on the financing of and investing in R&D, using a unique and rich database of high technology firms. These firms are located in twenty-eight provinces/districts throughout China. The enforcement of IP rights differs at the provincial level, although the firms are under the same set of national and international laws. To identify the causal effect of provincial level IP rights enforcement on firm behavior, we use several approaches to deal with the issues of endogeneity, reverse causality, and simultaneity. Controlling for provincial institutional factors such as economic development, banking system development, legal system performance, and local government corruption, we find that the enforcement of IP rights positively affects firms’ ability to acquire new external debt (including formal and informal financing) and external equity. Firms in provinces with better enforcement of IP rights invest more funding in R&D, generate more innovation patents, and produce more sales from new products. We also find better enforcement of IP rights encourages financing of and investment in R&D in foreign and ethnic joint ventures. The results confirm that enforcement of IP rights matters even in China. Our paper provides firm level evidence that financing of and investing in R&D are the channels that link enforcement of IP rights and economic growth.