The extremist religious group announced plans to picket the ceremony over the weekend, calling the late film critic and Pulitzer Prize winner a "f** enabler" for "mocking" them in a March 25 tweet, according to The Hollywood Reporter.
"Just another day at Westboro Baptist," Ebert wrote last month, linking to a story about one gay man's day with the group.
"Lord willing, WBC to picket in lawful proximity to the funeral of f** enabler Roger Ebert at "Preists (sic) Rape Boys" Holy Name Cathedral," Westboro said in a statement.
The group also calls Ebert an "American entertainment industry publicity leech" and a "fool" who "sold his soul for some fame & fortune."
Ebert was 70 years old when he died last Thursday after losing his battle with cancer.