Catherine Seipp (/saɪp/; November 17, 1957 – March 21, 2007) was a Los Angeles freelance writer and media critic.

She is best known for writing the weekly "From the Left Coast" column for National Review Online and a monthly column for the Independent Women's Forum and for her early recognition of the potential significance of the blogosphere.

Seipp married Jerry Lazar in 1986; their daughter, Maia, was born in 1989.

In addition to her regular columns, Seipp wrote for a variety of publications and websites, including Buzz, Mediaweek, UPI, New York Press, TV Guide, Reason, Forbes, Salon, Penthouse, Pages, Canada's National Post, and The Wall Street Journal.

During the 1980s, Seipp wrote a column titled "Miss Hot Tips" for the Los Angeles Daily News giving household hints and suggesting inexpensive but classy entertainments.