Big Brother 19 is the nineteenth season of the American reality television series Big Brother. It is based upon the Dutch series of the same name. The season premiered on June 28, 2017 on CBS in the United States with a two-hour season premiere and Julie Chen returning as host. The season was titled "Summer of Temptation" with the various contestants able to receive a temptation which gave the taker a surprise reward or game advantage but also unleashed a game change for one or more other players. Viewers at home were able to vote to offer selected chosen players a secret temptation. A weekly opt-in competition, known as the Temptation Challenge, would give the winner immunity from the week's nomination but also put the last-place finisher on the block as a third nominee, able to compete in the weekly Veto Competition and avoid a backdoor nomination.
On September 20, 2017, Josh Martinez won the game in a 5–4 vote against returning Big Brother 18 runner-up Paul Abrahamian. This marked the first season where a contestant lost multiple times in the Final 2.
Big Brother 19 is currently being produced by Endemol Shine North America and Fly on the Wall Entertainment with Allison Grodner and Rich Meehan returning as executive producers. This season of the program has been confirmed since August 10, 2016 as part of a multi season renewal between Endemol Shine North America and CBS which also includes its twentieth season tentatively scheduled for the summer of 2018.Julie Chen returned as the host of the series.
The main television coverage of the season was screened on CBS beginning June 28, 2017 with a two-hour season premiere. This season featured no changes to the schedule that was used in the previous edition, with episodes airing on Wednesday, Thursday, and Sunday each week. The weekly Thursday episode, which airs at 6 PM PDT, featured the live eviction and subsequent Head of Household competition taking place. During the live eviction, the show will be hosted by Julie Chen. The weekly Sunday episode, which airs at 5 PM PDT, features the nomination ceremony, as well as some highlights from the previous days. The weekly Wednesday episode, which also airs at 5 PM PDT, features the Power of Veto competition and the Power of Veto ceremony, along with more highlights of recent events in the House. The live Internet feeds which have been a staple of the program since its first season will return as part of CBS All Access. Alongside the weekly shows on CBS spin-off series Big Brother: After Dark will return on Pop for its twelfth season. The show serves as a live feed into the House, and is edited for profanity, nudity, slanderous statements and music copyrights.