AllSides rates The New York Post as having a Right media bias.
According to Wikipedia, The Post has been criticized for sensationalism, advocacy, and conservative bias. In 1980, the Columbia Journalism Review stated, "New York Post is no longer merely a journalistic problem. It is a social problem – a force for evil." (Columbia Journalism Review, volume 18, number 5 (Jan/Feb 1980), p. 22–23.)
According to a survey conducted by Pace University in 2004, the Post was rated the least-credible major news outlet in New York. It was the only news outlet to receive more responses calling it "not credible" than credible (44% not credible to 39% credible).
About The New York Post
The New York Post is the 13th-oldest newspaper published in the United States and is generally acknowledged as the oldest to have been published continuously as a daily. But, as is the case with most other papers, its publication has been periodically interrupted by labor actions. Since 1993, it has been owned by News Corporation, which had owned it previously from 1976 to 1988. It is the seventh-largest newspaper in the U.S. by circulation. Its editorial offices are located at 1211 Avenue of the Americas, in New York City, New York. The Post is known for its conservative editorial policy and sensationalist headlines. Source: Wikipedia