Which Kubrick film features a character named 'Lord Bullingdon'?

The Kubrick film featuring a character named Lord Bullingdon is *Barry Lyndon*.

Lord Bullingdon is Lady Lyndon’s son by her first husband, Sir Charles Lyndon. After Lady Lyndon marries the ambitious Irish adventurer Redmond Barry, Bullingdon views his new stepfather as a social climber exploiting his mother and her fortune. Their hostility becomes one of the film’s central conflicts.

Barry treats his stepson harshly while lavishly indulging his own son, Bryan. As Bullingdon grows older, he publicly confronts Barry over infidelity, abuse, and financial mismanagement. Later, after Bryan’s death and Lady Lyndon’s attempted suicide, Bullingdon returns and challenges Barry to a duel.

The film was released in 1975 and stars Ryan O’Neal as Barry. It is based on William Makepeace Thackeray’s 1844 novel *The Luck of Barry Lyndon*. Lord Bullingdon is therefore not the title character; he is the aristocratic heir whose position Barry tries, unsuccessfully, to appropriate.