Grantmakers of all kinds care about tangible progress on tough problems, but we also seek harder-to-measure results. Networks for social change can help on both of these fronts, building new capacity for making progress on complex problems and achieving significant measurable results. Tapping into network connections is becoming the norm for social change makers, whether we’re mapping influential relationships for an advocacy campaign, coordinating a protest to fight climate change or spreading an approach to community engagement. For funders, supporting and investing in networks is a prerequisite for remaining relevant in a world of fast moving information and ideas and tackling persistent, complex problems. This piece introduces the value of networks for making progress on complex problems, along with typical roles that funders play in networks, and it offers recommendations for investing in them most effectively.