The fourth season of Ghost Hunters premiered on Syfy on March 5, 2008.
| Season # | Title | U.S. Air Date | Production Code |
|---|---|---|---|
| 1 | Fort Mifflin | March 5, 2008 | 401 |
| 2 | Two to Tango | March 12, 2008 | 402 |
| 3 | Words From Beyond | March 19, 2008 | 403 |
| 4 | The Fear Cage | March 26, 2008 | 404 |
| 5 | Ghostly Bounty Hunter | April 2, 2008 | 405 |
| 6 | Wright-Patterson Air Force Base | April 9, 2008 | 406 |
| 7 | Ghostly Conversation | April 16, 2008 | 407 |
| 8 | Spirits of the Old West | April 23, 2008 | 408 |
| 9 | Haunted Asylum | April 30, 2008 | 409 |
| 10 | House of Spirits | May 28, 2008 | 410 |
| 11 | Widow's Watch | June 4, 2008 | 411 |
| 12 | Garden State Ghosts | June 11, 2008 | 412 |
| 13 | Fort Delaware | June 18, 2008 | 413 |
| 14 | Iron Island | September 3, 2008 | 414 |
| 15 | So She Married an Axe Murderer | September 10, 2008 | 415 |
| 16 | The Boy in the Brothel | September 17, 2008 | 416 |
| 17 | Speaking With the Dead | September 24, 2008 | 417 |
| 18 | Ghosts of the Sunshine State | October 1, 2008 | 418 |
| 19 | Oak Alley Plantation | October 8, 2008 | 419 |
| 20 | Bottled Spirits | October 15, 2008 | 420 |
| 21 | Hometown Haunts | October 22, 2008 | 421 |
| 22 | USS Hornet | October 29, 2008 | 422 |
| 23 | Ghost Hunters Live Roundtable Discussion | November 5, 2008 | 423 |
| 24 | All Access | November 12, 2008 | 424 |
| 25 | Recycled Souls | November 19, 2008 | 425 |
| 26 | Spirits on the Water | December 3, 2008 | 426 |
| 27 | Portsmouth Harbor Lighthouse | December 10, 2008 | 427 |
Trivia
- This is first appearance of Amy Bruni and Britt Griffith