ClariNet Communications Corp was an online newspaper service delivered over the internet. It was founded in 1989 in Waterloo, Ontario by Brad Templeton.

ClariNet delivered traditional newspaper and magazine content using Usenet newsgroup technology, existing as a proprietary newsgroup hierarchy independent to the Big 8 hierarchies. News was delivered over the internet using NNTP as well as UUCP.

In the late 1980s, the Internet in the United States consisted of a variety of regional hubs connected by the NSFNet. Overtly commercial traffic was not permitted due to the Acceptable Use Policy. Templeton reports convincing Stephen Wolff, director of NSFNet, that a news service sold to universities and research labs on the internet for use in research and education would not violate the AUP, even though it was a for-profit effort.

It has some claim to being the earliest company created to use the internet as a business platform, commonly known as a dot-com company.

The initial announcement of a for-profit internet-based business was announced in June 1989 and generated significant controversy with some expressing fear of a destruction of the non-profit culture of the network. The first subscribing customer was Stanford University.

ClariNet began publishing the news of UPI and Newsbytes and other typical newspaper wire sources. It also included material form newspaper syndicates, such as the popular Dave Barry column and the first internet based comic strips, including Dilbert by Scott Adams. The 'Street Price Report' published a database of advertised prices for computer products in magazines, presaging the creation of Comparison shopping websites later in the decade.

In 1994 ClariNet switched from UPI to the Associated Press and Reuters. Other services added included the Commerce Business Daily, PR Newswire and Business Wire

ClariNet grew quickly for the pre-dot-com-boom era, and was the highest ranked dot-com company on the 1996 Inc. Magazine 500.