The Pinwheel Network
This was the original logo for the channel when it launched in December 1, 1977; at the time of its original debut, Nickelodeon was named The Pinwheel Network. The pinwheel is on the left side on the text.
In 1979, The Pinwheel Network was renamed Nickelodeon. This was the first used Nickelodeon logo.
This logo was introduced in 1981. The logo was designed by Lou Dorfsman and consists of rainbow letters set in Frankfurter font; a pinball was added by Bob Klein and placed behind the letters. The pinball theme was used in the network's IDs during the period including one that used early '80s-era computer-generated graphics. The logo shown above has no black lines for the print version.
1984–2010, 2011-2012 (website)
From October 8, 1984 to September 28, 2009 (February 15, 2010 In The UK) Nickelodeon has used lots of different logos, with a common theme. They were all orange silhouettes with the Nickelodeon wordmark written on them in white Balloon font. Eventually, the "splat" design would be the most used; the orange splat represents the slime that Nickelodeon has been known for ever since the network began broadcasting the Canadian series You Can't Do That on Television in 1981, a trademark which Nickelodeon would later adopt as part of its own programming. Designed by Fred/Alan Inc. originally with just a star in mind, it has grown to be known as the most well-known and recognizable Nickelodeon logo. The wordmark was applied to a smorgasbord of objects over the years, and was very rarely seen standing alone.
Beginning in April 2003, Nickelodeon would discontinue their older logos in place of splat themed logos for the next eight years before the rebrand on September 28, 2009. At this time almost all shapes were retired. In 2007 bigger version was made and retired some long splat logos. Also a 3D version of the logo debuted.
2009–present (2010-present in other regions)
A new logo and look for Nickelodeon was unveiled in February 2009. It made its debut on the United States flagship channel on September 28, 2009. When Nickelodeon changed their logo, The N, Noggin, and Nicktoons Network were also rebranded as TeenNick, Nick Jr. and Nicktoons, with their logos in this style, respectively. In 2010, They Officialy Started Using It. In April 2011, Nickelodeon unveiled new variations of the background that also interact with the logo's color. The current font used on this logo is a custom font which resembles Bauhaus 93, a mock-up of which is available for free download here. This logo was placed 3rd in Part 2 (the best) of the 2009 Brand New Awards.
The alternative "Nick" version of the logo is used more often in the United States than the other logo. The new Nickelodeon logo was rolled out internationally during 2009 accordingly:
- January 29: France
- February 15: UK and Ireland
- March 1: Poland 
- March 31: Germany/Austria/Switzerland
- June 25: India 
- September 28: United States
- For other related logos and images see: Nickelodeon/Other, Nickelodeon/Idents, and Nickelodeon/Other IDs