Approximately 3,401 people attended the 2014 Oscars. This does not include the people who filled the stands lining the red carpet outside the theater or staff and press members working backstage or elsewhere in the theater.
Although the number of attendees is not published by the Oscars, it is possible to figure an approximate number by checking the capacity of the location in which the awards are held. The ceremony was held in the Dolby Theater in 2014. The Dolby theater has a seating capacity of 3,401. Since the Oscars is the biggest annual event for the movie industry and draws millions of viewers worldwide, it is reasonable to assume that every available seat was occupied.