The National Fantasy Fan Federation Speculative Fiction Awards, the Neffy Awards, have been awarded annually since 2005, and on occasion under different names since 1949, for works from the previous year. The award categories fluctuate from year-to-year with new categories being added and old ones dropped according to nomination votes.
| Year Released | Category | Recipient |
| 2017 | Best novel | Ryk Spoor Princess Holy Aura |
| Best Shorter Work | Sarah Pinsker And Then There Were (N-One) | |
| Best Book Editor | Toni Weisskopf | |
| Best Film | Thor Ragnarok | |
| Best Fanzine | Tightbeam | |
| Best Blog | MadGeniusClub | |
| Best TV Show | Supergirl | |
| Best Anime | The Ancient Magus Bride | |
| Best Graphic Art Publication | Jean Grey | |
| 2016 | Best Novel | Brandon Sanderson Shadows of Self |
| Best Paper Series Novel | Chris Nuttall Schooled in Magic | |
| Best Editor | Toni Weisskopf – Baen | |
| Best TV Show | Supergirl | |
| Best Comic | Girl Genius | |
| Best Film | The Martian | |
| 2015 | Heroic Achievement | All Hugo Fandom — for reviving the all-hobby fan feud |
| Best Editor | Toni Weisskopf – Baen | |
| 2012 | Best Pro Artist | Jonas De Ro |
| Best Animated Movie | Wreck it Ralph – Disney | |
| Best Fantasy Movie | The Avengers – Disney | |
| Best SF Movie | Robot & Frank – Samuel Goldwyn & John Carter – Disney (tie) | |
| Best Horror Movie | The Cabin in the Woods – Lionsgate | |
| Best Fantasy TV | Once Upon a Time – ABC | |
| Best Horror TV | Supernatural – CW | |
| Best SF TV | Doctor Who – BBC | |
| Best Fantasy Author | Saladin Ahmed – Throne of the Crescent Moon | |
| Best SF Author | Lois McMaster Bujold – Captain Vorpatril’s Alliance | |
| Best Horror Author | Karina Halle – On Demon Wings | |
| Best Fan Artist | K. Cherdrumphai | |
| Best Fan Writer | Jean Lamb | |
| Best Fanzine | SF Signal | |
| Best Fantasy Movie | The Avengers – Disney | |
| 2011 | Best Fantasy Movie | Harry Potter and the Deathly Hallows – Part 2 |
| Best SF Movie | Contagion – Warner Bros. | |
| Best Super Hero/Comics Movie | Captain America: The First Avenger – Disney | |
| Best SF TV | Doctor Who – BBC | |
| Best Horror TV | The Walking Dead – AMC | |
| Best Fantasy TV | A Game of Thrones | |
| Best Horror Author | Jim Butcher – Ghost Story | |
| Best SF Author | China Miéville – Embassy Town | |
| Best YA SF-F Author | Ransom Riggs – Miss Peregrine’s Home for Peculiar Children | |
| Best Fanzine | File 770 – Mike Glyer | |
| 2010 | Best SF/F Animation | Despicable Me – Universal |
| Best SF/F Author | Suzanne Collins – Mockingjay | |
| Best SF/F Movie | Inception – Warner Bros. | |
| Best SF/F TV | Dollhouse – FOX | |
| Best Website | tor.com | |
| Best Fansite | theonering.net | |
| Best Fanzine | eI – Earl Kemp | |
| 2009 | Best TV Animation | Star Wars: The Clone Wars – TOON |
| Best Film Animation | Avatar – 20th Century Fox | |
| Best Pro Artist | Frank Frazetta | |
| Best SF Author | Stephen King – Under the Dome | |
| Best Fantasy Author | China Mieville – The City & The City | |
| Best Comic | Robert Kirkman – The Walking Dead – AMC | |
| Best Video Game | Batman: Arkham Asylum | |
| Best SF Movie | Star Trek – Paramount | |
| Best Fantasy Movie | Harry Potter and the Half-Blood Prince – Warner Bros. | |
| Best SF TV | Doctor Who – BBC | |
| Best Fantasy TV | True Blood – HBO | |
| Best Website | news.Ansible.co.uk | |
| Best Pro Zine | Weird Tales | |
| Best Fansite | eFanzines.com | |
| Best Fanzine | The National Fantasy Fan – Heath Row | |
| Fan of the Year | Patricia King | |
| 2008 | Best Animation | Wall-E |
| Best SF/F Author | Greg Bear – City at the End of Time | |
| Best SF/F Movie | The Dark Knight – Warner Bros. | |
| Best Website | io9.com | |
| Best SF/F TV | Torchwood – BBC | |
| Fan of the Year | Heath Row | |
| Best Fanzine | FAPA | |
| 2007 | Best Animation | Ratatouille – Pixar |
| Best Pro Artist | Tom Kidd | |
| Best SF/F Author | JK Rowling – Harry Potter and the Deathly Hallows | |
| Best SF/F Movie | The Golden Compass – New Line | |
| Best SF/F TV | Supernatural – CW | |
| Fan of the Year | Jacqueline Lichtenberg | |
| Best Fanzine | The Drink Tank – Chris Garcia | |
| Best Fansite | eFanzines.com | |
| 2006 | Best Animation | Tripping the Rift – SCIFI |
| Best Pro Artist | Boris Vallejo and Julie Bell (tie) | |
| Best Fan Artist | Brad Foster | |
| Best SF/F Author | Naomi Novik – His Majesty’s Dragon, Throne of Jade, Black Powder War | |
| Best SF/F Movie | Pan’s Labyrinth – Picture House | |
| Best Website | SFCrowsnest.com | |
| Best SF/F TV | Doctor Who – BBC | |
| Fan of the Year | Joy Beeson | |
| Best Fanzine | Science Fiction Five-Yearly | |
| 2005 | Best TV Animation | Inuyahar |
| Best Animation – Film | Wallace and Grommit: Curse of the Were-Rabbit | |
| Best Pro Artist | Melissa Gay | |
| Best Comic | Supergirl | |
| Best Fan Artist | Lynn Masamitsu | |
| Best SF Author | John Varley – Mammoth | |
| Best Fan Writer | Jefferson Swycaffer | |
| Best Fantasy Author | J. K. Rowling – Harry Potter and the Half-Blood Prince | |
| Best Reprint | C. S. Lewis – The Lion the Witch and the Wardrobe | |
| Best Board/RPG Game | Serenity RPG | |
| Best Video Game | Eve Online | |
| Best SF Movie | Serenity – Universal | |
| Best Fantasy Movie | Chronicles of Narnia: The Lion the Witch and the Wardrobe | |
| Best Classic on DVD | Wizard of Oz box set | |
| Best SF TV | The 4400 – USA | |
| Best Fantasy TV | Lost – ABC | |
| Best Pro Website | SciFi.com | |
| Best Fansite | efanzines.com | |
| Best Print Fanzine | Locus | |
| Best eZine | Emerald City | |
| Fan of the Year | Howard DeVore | |
| 2004 | Best Animation | Sky Captain and the World of Tomorrow |
| Best Pro Artist | Donato Giancola | |
| Best Pro Author | C. J. Cherryh – Forge of Heaven | |
| Best Collector’s Edition (video) | Star Wars Trilogy Boxed Set – 20th Century Fox | |
| Best Comic | Fantastic Four – Marvel | |
| Best Game | Star Wars Trading Card Game – Lucasfilm, Wizards of the Coast | |
| Best Movie | Spiderman 2 – Columbia | |
| Best Web Site or Reference | Locus Online | |
| Best Classic Reprint | Glory Road – Robert A. Heinlein | |
| Best TV | Stargate: SG-1 – SCI FI (MGM) | |
| Best Video Game | Halo 2 – Bungie Software | |
| Fan Of the Year | Janine Stinson | |
| Best Fanzine | Ansible | |
| Fan Web Site | Fanac Fan History Project |