Mathilde Krim, a friend of Richardson, said the somber affair that included a viewing of Richardson's body was conducted respectfully.
Richardson, known for her roles in movies such as "Evening" and "The White Countess," died Wednesday after suffering a severe head injury in a skiing accident Monday in Canada.
Neeson and Richardson, who were married in 1994, have two sons, Micheal, 13, and Daniel, 12.
The Times of London said Neeson's film career is on hold as he deals with his wife's death.
The newspaper said Neeson left the set of Canadian filmmaker Atom Egoyan's "Chloe" to be with his dying wife and no date has been reported regarding his possible return.
Scarlett Johansson steps out with fiance after pregnancy reveal
Susan Sarandon 'very excited' about daughter's pregnancy