Pinoy Big Brother: All In is the first special and eleventh season overall of Pinoy Big Brother. Toni Gonzaga, Bianca Gonzalez, Robi Domingo, and John Prats reprised their roles as hosts. For the first time in the history of Big Brother Worldwide, the Regular, Celebrities and Teen housemates lived together inside the Big Brother house.
The show aired on April 27, 2014 on ABS-CBN, replacing The Biggest Loser Pinoy Edition: Doubles. The show aired 10:15 p.m. (PST) every Mondays to Fridays; 9:30 p.m. (PST) every Saturdays; and 9:45 p.m. (PST) every Sundays.
Nineteen housemates had entered the house, 17 on Day 1, and two on Days 21 and 49, and the season lasted 120 days, ending on August 24, 2014. Daniel Matsunaga emerged as the season's winner, the third celebrity to win in the franchise.
Lauren Dyogi, the Director and Business Unit Head of the show, confirmed the show was renewed for a fifth season and audition schedules were soon to be announced. The network officially announced the auditions on September 15, 2013 during an episode in The Voice of the Philippines. The official air date was not revealed in the announcement.
In April 2014, promotional teasers were aired. The first teaser was an audition video of Kim Chiu, the franchise's first teen winner. Another teaser was aired about the love story of Melai Cantiveros and Jason Francisco who became lovers inside the show and were now married. A grand mini reunion, attended by some of the former housemates of the Regular, Celebrity and Teen Seasons and hosts of the show, was also held at ASAP 19 on April 20.
In an interview aired February 10, 2014 on Banana Nite, Toni Gonzaga confirmed that the show will return in March 2014. It was later moved on April 27, 2014. The show will occupy the vacated timeslot of The Biggest Loser Pinoy Edition: Doubles. The show's companion show, Pinoy Big Brother: All In Über, will be aired weekdays as part of the Kapamilya Gold block.