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- Season 8 overviewSep 29, 2017-May 18, 201825 episodesSeason 8 episodes1. A'ole E 'Olelo Mai Ana Ke Ahi Ua Ana Ia Sep 29, 2017
- McGarrett and Danny recruit Tani Rey when a hacker releases a dangerous arsonist from prison.
- 2. Na La 'ilio Oct 6, 2017
- The team works with an injured police dog that is the only witness to an ambushed drug bust.
- 3. Kau Pahi, Ko'u Kua. Kau Pu, Ko'u Po'O. Oct 13, 2017
- The team enlists an old friend when a crime boss is murdered, triggering revenge killings.
- 4. E Uhi Wale No 'A'Ole E Nalo, He Imu Puhi Oct 20, 2017
- When a system hack puts the lives of informants at risk, McGarrett enlists the help of a hacker.
- 5. Kama'oma'o, Ka 'Aina Huli Hana Nov 3, 2017
- The team investigates a string of murders that mirrors stories from well-known Hawaiian folklore.
- 6. Mohala I Ka Wai Ka Maka O Ka Pua Nov 10, 2017
- The murder of two tourists leads the team to a man who has multiple personality disorder.
- 7. Kau Ka 'Onohi Ali'i I Luna Nov 17, 2017
- A bank heist in progress forces Steve to make a potentially heartbreaking mistake.
- 8. He Kaha Lu'u Ke Ala, Mai Ho'okolo Aku Dec 1, 2017
- McGarrett poses as a pilot to investigate a plane crash that led to the death of a pilot.
- 9. Make Me Kai Dec 8, 2017
- McGarrett, Danny, Tani, and Junior are exposed to a deadly biological weapon.
- 10. I Ka Wa Ma Mua, I Ka Wa Ma Hope Dec 15, 2017
- Danny is shot while quarantined in the hospital; while unconscious, he imagines everyone's future.
- 11. Oni Kalalea Ke Ku a Ka La'au Loa Dec 15, 2017
- Danny tells Charlie a bedtime story about a case involving bad Santas and a holiday miracle.
- 12. Ka Hopu Nui 'Ana Jan 5, 2018
- McGarrett rounds up every gang-related criminal on the island to find out who killed an FBI agent.
- 13. O Ka Mea Ua Hala, Ua Hala Ia. Jan 12, 2018
- Grover must prevent a man who is accused of killing his wife from committing suicide.
- 14. Na Keiki a Kalaihaohia Jan 19, 2018
- The corpse of a diamond smuggler is stolen from a graveyard; Five-0 tracks down his partner.
- 15. He Puko'a Kani 'Aina Feb 2, 2018
- McGarrett and Danny investigate the murder of a private detective whose client was also killed.
- Tani and Junior go under cover to infiltrate a private school where the headmaster was murdered.
- 17. Holapu Ke Ahi, Koe Iho Ka Lehu Mar 9, 2018
- Adam's mission goes sideways when the bait he uses falls into the wrong hands.
- 18. E Ho'oko Kuleana Mar 30, 2018
- The ex-wife of the man who shot Danny reveals how Danny helped save her life.
- A hit man McGarrett's father failed to arrest comes to McGarrett to finally confess his crimes.
- 20. He Lokomaika'i Ka Manu O Kaiona Apr 13, 2018
- Uranium must be found before a terrorist makes dirty bombs with it; Junior gets trapped in a ravine.
- 21. Ahuwale Ka Nane Huna Apr 20, 2018
- McGarrett and Danny must help to track down a teenage British royal who has run away.
- 22. Kopi Wale No I Ka I'a a 'Eu No Ka Ilo. Apr 27, 2018
- Duke is forced to steal crucial evidence to exchange for his kidnapped granddaughter.
- 23. Ka Hana a Ka Makua, O Ka Hana No Ia a Keiki May 4, 2018
- The team takes on the mob when a former boss is killed; Junior's friend witnesses the murder.
- The team goes on a mission to capture an elusive person who is holding McGarrett's mentor hostage.
- 25. Waiho Wale Kahiko May 18, 2018
- The team discovers a Russian spy ring hiding on Oahu when a Russian submarine appears off the coast.