David William Titley[1] (born 1958)[2] is a professor of meteorology at Pennsylvania State University and the founding director of their Center for Solutions to Weather and Climate Risk.

[4][6] Titley initiated the Navy's Task Force on Climate Change, and serves on the CNA Corporation's Military Advisory Board.

[9] The Department of Defense requested that Titley present on their behalf at both Congressional Hearings and the Intergovernmental Panel on Climate Change (IPCC) meetings from 2009 to 2011.

[4] Titley is a member of the Hoover Institution's Arctic Security Initiative, and serves on the Advisory Boards of the Applied Research Laboratory at Penn State, the Center for Climate and Security, Columbia University's Center for Research on Environmental Decisions, and the Association of Climate Change Officers.

[11] In 2023 he received the Friends of the Planet award from the National Center for Science Education (NCSE) according to the executive director Ann Reid, “David Titley's focus on the importance of climate change in thinking about military preparedness and international relations is extraordinarily valuable”.