Larry Downes (born March 1, 1959) is an Internet industry analyst and author on business strategies and information technology. Downes is best known for his first book, Unleashing the Killer App: Digital Strategies for Market Dominance (Harvard Business School 1998), which focuses on the potential of products and services for dramatically changing business. Unleashing the Killer App was a New York Times bestseller, sold over 200,000 copies, and was named by the Wall Street Journal one of the five most important books on business and the Internet ever published.