Library Guides: Datasets:

Awesome Public Datasets on Github A Github repo of public datasets, most of which are free.
Canada Open Data Portal Search open data that is relevant to Canadians, learn how to work with datasets, and see what people have done with open data across the country.
DataONE DataONE is a network of interoperable data repositories facilitating data sharing, data discovery, and open science.
EU Open Data Portal The EU Open Data Portal is the point of access to public data published by the EU institutions, agencies and other bodies. Information can be used and reused for commercial or non‑commercial purposes. The portal is a key instrument of the EU open data strategy.
FiveThirtyEight Data The data and code behind some of the articles and graphics on the popular website.
Google Dataset Search Google Dataset Search is a search engine from Google that helps researchers locate online data that is freely available for use. The product is targeted at scientists and data journalists.
International Monetary Fund [INF] Time series data on IMF lending, exchange rates and other economic and financial indicators.
NASA Open Data Catalog DATA.NASA.GOV is NASA's clearinghouse site for open-data provided to the public. An API is available to developers at api.nasa.gov
National Oceanic and Atmospheric Administration [NOAA] Climate Data Online (CDO) provides free access to NCDC's archive of global historical weather and climate data in addition to station history information. These data include quality controlled daily, monthly, seasonal, and yearly measurements of temperature, precipitation, wind, and degree days as well as radar data and 30-year Climate Normals.
NYC Open Data NYC Open Data is free public data published by New York City agencies and other partners.
Quandl Some free financial, economic and alternative datasets. Quandl has free open data feeds and the API for stock data is free for registered users.
U.K. data.gov.uk Census data and more-- find data published by central government, local authorities and public bodies to help you build products and services
U.S. Bureau of Economic Analysis [BEA] GDP Gross domestic product, savings rates, corporate profits
U.S. Bureau of Economics BEA Data Explore BEA Data
U.S. Bureau of Labor Statistics [BLS] Databases, Tables & Calculators by Subject
U.S. Census Bureau Explore census data
U.S. data.gov With over 180,000 data sets, data.gov improves public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government
U.S. Federal Reserve Economic Data [FRED] St. Louis Fed. Download, graph, and track 765,000 US and international time series from 96 sources. Also has a developer API.
UCI Machine Learning Repository Hosted by University of California Irvine, this repository contains over 500 data sets as a service to the machine learning community, many ready for modeling.
UNICEF data UNICEF Data Warehouse has been designed to allow easy access to those indicators across a range of countries, with some datasets spanning back decades.
WHO Open Data Repository Search and browse the wide range of data collections related to global health and well-being that are managed and maintained by WHO.
WorldBank WorldBank data catalog includes demographics, census, health, geographic, GDP, income-- data types include time series, microdata, geospatial