The eighth season of the reality game show Pinoy Big Brother, subtitled Otso (Spanish for eight), aired on ABS-CBN for 268 days from November 10, 2018 to August 4, 2019, replacing Star Hunt: The Grand Audition Show, What's Wrong with Secretary Kim and The Kids Choice and was replaced by Gangnam Beauty, Encounter, the second season of I Can See Your Voice and iWant Originals.

An additional online companion show called PBB Bring 8 On!, which streamed simultaneously with the primetime TV program, also aired live via show's various social media accounts; it was hosted by Dawn Chang of Pinoy Big Brother: 737, Fifth Solomon of Pinoy Big Brother: All In, and Pamu Pamorada of Pinoy Big Brother: Unlimited.

[5] An online show, YouthTube, which was hosted by Robi Domingo and Bianca Gonzales commenced on November 22, 2018.

An afternoon edition titled Pinoy Big Brother: Otso Gold aired at 5:15 p.m. after Los Bastardos.

The weekend primetime program was originally aired at 7:30 p.m. during the batch 1 teens; however, after the first season of I Can See Your Voice ended, Pinoy Big Brother: Otso moved its timeslot to 10:00 p.m. on Saturdays and 9:30 p.m. on Sundays in order to give the timeslot to World of Dance Philippines since the batch 2 adults.

From his livestream, Dyogi has stated that the show has upgraded to using HD PTZ cameras,[5] making Otso the first season to fully broadcast in high definition and in 16:9 aspect ratio (Lucky 7's Vietnam leg was shown in 16:9, but the show reverted to 4:3 upon the housemates' return to the Philippines.

The one-way mirror system, used in earlier seasons for cameramen to capture events in the house, was no longer present.

[3] On the other hand, the ultimate winner would take home ₱2,000,000 (₱1,000,000 from Miniso and ₱1,000,000 from the show), a condominium unit Suntrust Asmara from Suntrust Properties, Inc.,[13] a water refilling station business package worth ₱800,000, and a travel package worth ₱300,000 from Jag Jeans.

[14] Yen Quirante won a condominium unit from Suntrust Properties, Inc. during the third Pinoy Big Batch-Bakan.

[16] Since its official announcement on October 20, 2018, much information about this season has not been made public until November 9, 2018, when Dyogi discussed its details on a livestream.

At the beginning of each batch's stay, 16 shortlisted contestants, known in the show as Star Dreamers, would take part in different tasks to determine who will be given housemate status, until eight are chosen.

By the seventh week, housemates would be participating in challenges or face the public vote, as part of the eviction process, until four are left.

[20] The season's eviction theme song was performed by Moira Dela Torre entitled "Before It Sinks In", written by herself and was part of her debut studio album Malaya.

The council consists of past winners: Season 1's Nene Tamayo, Celebrity 1's Keanna Reeves, Celebrity 2's Ruben Gonzaga, Teen Edition Plus's Ejay Falcon, Teen Edition 4's Myrtle Sarrosa, All In's Daniel Matsunaga, 737's Jimboy Martin, and Lucky 7's Maymay Entrata.

On Day 2, three winners from the council were replaced by three ex-housemates: All In's Loisa Andalio, 737's Barbie Imperial, and Lucky 7's Edward Barber.

However, in the case of Kim and Camille of batch two, they were still considered Star Dreamers when they crossed over to the House on Day 62.

This is the list of 88-second challenges for the first batch of teen housemates: Seth31 points For Star Dreamers that didn't make the cut, they would be sent to the Camp.

For them to crossover to the house, the team and individual scores of each will be added to determine their final points.

On Day 55, Shawntel and Thea crossed over to the Big Brother House as the official housemates; it was revealed that after this crossover, there will be no new additional Star Dreamers that would enter the Camp.

[53] On Day 62, evicted housemates Abi, JC, Tori, and Wakim entered the Camp to become House Challengers, together with the other Star Dreamers.

An additional challenge was given on Day 12 wherein at the instance of Big Brother, a certain number of housemates will have to practice their choreography lying down.

Every Saturday, the housemates would compete in a for immunity from nominations; there will be celebrity guests that would be participating for certain roles in the challenge.

For the first week, Bayani Agbayani, Axel Torres from All In, Janella Salvador and McCoy de Leon from Lucky 7 took part in the challenge.

[56] For the second week of the challenge, Nyoy Volante, Melai Cantiveros, Billy Crawford and Jed Madela judged the teen housemates' performance.

For batch three's nominations and evictions, Big Brother implemented a new immunity challenge called the Golden Circle.

The Housemates agreed on the same sequence for both rounds, which is: Ashley, Kaori, Lie, Fumiya, Yamyam, Lou, Kiara, Andre.

The Big Night for this season was held at the AATF Sports Complex in Imus, Cavite on August 3 and 4, 2019.

The finale featured variety of Kapamilya stars, Ex-Star Dreamers, Ex-housemates and other former housemates including past Pinoy Big Brother Big Winners such as Nene Tamayo of Season 1, Keanna Reeves of Celebrity 1, Ejay Falcon of Teen Plus, James Reid of Teen Clash, Myrtle Sarrosa of Teen 4, Daniel Matsunaga of All In, Miho Nishida and Jimboy Martin of 737 and Maymay Entrata of Lucky 7, the 2nd Big Placers such as Jason Gainza of Season 1, Ryan Bang of Teen Clash, Maris Racal of All In and Ylona Garcia of 737, the 3rd Big Placers such as Wendy Valdez of Season 2, Jane Oineza of All In and Yong Muhajil of Lucky 7, the 4th Big Placers such as Gee-Ann Abrahan of Season 2, Will Devaughn of Celebrity 2, Joj and Jai Agpangan of Teen 4, Dawn Chang of 737 and Edward Barber of Lucky 7, and other former housemates including evicted, forced eviction, and voluntary exit such as previous seasons of Pinoy Big Brother.

On August 3, the combined result of the Ultim8 Challenge and the public's votes determined the final standing of the Big Otso.

Star Music together with ABS-CBN created an album for this season entitled Ang Soundtrack Ng Bahay Mo and was released on May 12, 2019.