The Ballymena-born 59-year-old triumphed in two separate polls for Sky Movies and Lovefilm, which also saw Colin
Pierce Brosnan highly ranked.
Neeson's roles have included leads in Schindler's List and
Michael Collins, Jedi master Qui-Gon Jinn in
Star Wars prequel The Phantom Menace and voicing Aslan in the Narnia series.
In a poll for Sky Movies - to mark its Irish actors season being screened on Saturday and Sunday - Neeson took a fifth of the votes. Second place went to
Peter O'Toole, with Farrell third and
Brosnan in fourth place.
The vote for streaming and rental service Lovefilm ahead of St Patrick's Day on March 17 places Farrell as runner-up with
Michael Fassbender third and
Brendan Gleeson fourth.
Ian Lewis, director of Sky Movies, said: "
Liam Neeson has shown why he is one of the most trusted and versatile actors of our time.
"Audiences continue to warm to his films and will no doubt flock to see him in Battleship and Wrath Of The Titans."