Andy Baio (born 1977) is an American technologist and blogger. He is the co-founder of the XOXO festival, founder of the Upcoming social calendar website, a former CTO of Kickstarter, and the author of the Waxy.org blog.

In 2003, while working as a webmaster at a Texas-based financial company, Baio launched the Upcoming collaborative event calendar. The site was acquired by Yahoo for $2 million in 2005 and Baio joined the company as the site's Technical Director. In 2007, Baio announced his departure from Yahoo.

In September 2008, Baio joined the board of directors of Kickstarter, a crowdfunding website that helps people with project ideas to connect with potential funders. Baio later joined the staff as Chief Technical Officer in July 2009, stepping down in November 2010 to join Expert Labs. After Yahoo closed Upcoming and offered to sell the domain back to Baio, he launched a Kickstarter campaign that surpassed its $30,000 goal in May 2014 to revive the site.

In June 2017, Baio joined the Fuzzco creative studio as Technology Director.

In October 2018, Baio and his fellow XOXO festival cofounder Andy McMillan announced they would be taking over Drip, a creator funding platform that Kickstarter had acquired in 2016. Kickstarter continued to run the platform while Baio and McMillan took it over, and Kickstarter provided the duo with seed funding. Baio and McMillan started a public-benefit corporation, separate from Kickstarter, to run the project. However, in mid-2019, they shut it down before launching and returned the remaining funding to Kickstarter, saying that they could not find a way to sustainably run the business without exposing the creators who would rely on it to too much risk.

In 2021, Baio launched the Skittish virtual event platform, where participants could move around as virtual animal avatars and interact with other inhabitants via spatial voice chat. Wired described the project as "equal parts audio chat, serendipity, and Animal Crossing." The platform was funded with a grant from Grant for the Web, a program in turn funded by Mozilla, Creative Commons, and a micropayments startup. Skittish shut down in December 2022.

Baio was involved in the early dissemination of the Star Wars Kid viral video, which depicted teenager Ghyslain Raza clumsily emulating martial arts moves for the camera. In response to the negative attention the boy received, Baio and another blogger, Jish Mukerji, organized a fundraiser for Raza which gathered almost $1,000 from about 100 donors. In March 2022, Baio met Raza and apologized to him for amplifying the video. Baio later said in the documentary Star Wars Kid: The Rise of the Digital Shadows that he had "enormous regret about posting the video." Raza accepted his apology, saying that Baio "provides a beautiful lesson of humanity that a good person can make a mistake and that mistake can have very important consequences but that, at the end of the day, Andy could be like any one of us."

When the parody cartoon House of Cosbys was taken down from its original site due to a cease and desist letter from Bill Cosby's attorney, Baio placed the videos on his own website. Baio later received a similar cease and desist letter but refused to comply, citing fair use and decrying what he termed "a special kind of discrimination against amateur creators on the Internet", since Cosby had often been parodied in the mainstream media.