'''DDN''' may refer to:
==Arts, media and entertainment== * ''Daydream Nation'', a music album by Sonic Youth * ''Dayton Daily News'', a daily newspaper in Dayton, Ohio, US * Digital Delivery Network, a service of the Community Radio Network in Australia * Digital Distribution Netherlands, a Dutch digital music distributor * Double Down News, an alternative media outlet in the UK * ''Dustin's Daily News'', a comedic current affairs TV show
==Computing== * DataDirect Networks, a data storage company * Defense Data Network, a separate instantiation of the ARPANET used by the U.S. Department of Defense from 1983 to 1995 * Dot-decimal notation, a human readable way to write IPv4 internet addresses
==Other uses== * Dehradun railway station (station code), India * Digital Divide Network, an online community of activists
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