Brian Halligan is an American executive and author. He is a CEO and co-founder of HubSpot, an Internet marketing company based in Cambridge, Massachusetts, and is also a senior lecturer at MIT. Halligan uses the term inbound marketing to describe the type of marketing he advocates. He has co-authored two books on marketing: Inbound Marketing: Get Found Using Google, Social Media, and Blogs with HubSpot co-founder Dharmesh Shah and Marketing Lessons from the Grateful Dead: What Every Business Can Learn from the Most Iconic Band in History with David Meerman Scott.

Halligan was born in Westwood, Massachusetts, and grew up and attended public schools in Westwood, Massachusetts. He received a Bachelor of Science degree in Electronic Engineering from the University of Vermont and an MBA from MIT Sloan School of Management in 2005.

Halligan also serves on the board of directors of House of Possibilities, a community service organization and the Massachusetts Innovation and Technology Exchange (MITX).

Halligan's first book, Inbound Marketing, was co-authored with HubSpot co-founder Dharmesh Shah. The thesis of the book is that people now block marketing that interrupts them, such as advertisements and spam, that instead companies need to provide information that is useful to prospects, who will then self-identify. Reviewing the book, Meryl Evans said that it contains "elementary stuff..." but it "does a good job for those who don’t have a clue about how to use social media for business." It was also reviewed in The Boston Globe.

He was an entrepreneur in residence at MITband is presently a senior lecturer there, teaching "Entrepreneurial Product Development and Marketing" with Elaine Chen.He is also an occasional lecturer at Sloan on the science of selling and marketing.