There are various competitions that attempt to find the best science fiction, fantasy and horror of each year, and I've collated the winners and nominees from what seems to be the major awards in a series of posts (see the very bottom for links to all of them). The requirement for inclusion is that the award ceremony occurs in the current year (as listed in the title), so the post will be updated as they are announced throughout the year.
The awards considered are: Arthur C. Clarke, Bram Stoker, British Fantasy, BSFA, Compton Crook, Dragon, Eugie, Hugo/Lodestar, John W. Campbell Memorial, Lambda, Locus, Nebula/Andre Norton, Otherwise, Philip K. Dick, Prometheus, Shirley Jackson, Sturgeon and World Fantasy.
The ordering is based on the "score" of each book, with a nomination giving 1 point, and a win giving 1.5 points. Otherwise it's ordered by title.
Anthologies
4: Black Feathers: Dark Avian Tales: An Anthology - Ellen Datlow Bram Stoker Locus Shirley Jackson World Fantasy Amazon UK Amazon US
3: The Djinn Falls in Love and Other Stories - Mahvesh Murad, Jared Shurin Locus Shirley Jackson World Fantasy Amazon UK Amazon US
2.5: The Book of Swords - Gardner Dozois Locus - Winner World Fantasy Amazon UK Amazon US
2: The Best of Subterranean - William Schafer Locus World Fantasy Amazon UK Amazon US
1.5: Behold!: Oddities, Curiosities and Undefinable Wonders - Doug Murano Bram Stoker - Winner Amazon UK Amazon US
1.5: New Fears - Mark Morris British Fantasy - Winner Amazon UK Amazon US
1.5: Shadows and Tall Trees Volume 7 - Michael Kelly Shirley Jackson - Winner Amazon UK Amazon US
1.5: The New Voices of Fantasy - Peter S. Beagle World Fantasy - Winner Amazon UK Amazon US
1: 2084 - George Sandison British Fantasy Amazon UK Amazon US
1: Bookburners - Max Gladstone Locus Amazon UK Amazon US
1: Cosmic Powers - John Joseph Adams Locus Amazon UK Amazon US
1: Dark Satanic Mills: Great British Horror Book 2 - Steve Shaw British Fantasy Amazon UK Amazon US
1: Imposter Syndrome - James Everington, Dan Howarth British Fantasy Amazon UK Amazon US
1: Infinity Wars - Jonathan Strahan Locus Amazon UK Amazon US
1: Looming Low - Justin Steele, Sam Cowan Shirley Jackson Amazon UK Amazon US
1: Nights of the Living Dead - George A. Romero, Jonathan Maberry Bram Stoker Amazon UK Amazon US
1: Pacific Monsters - Margaret Helgadottir British Fantasy Amazon UK Amazon US
1: Sycorax's Daughter's - Kinitra D. Brooks Bram Stoker Amazon UK Amazon US
1: Tales From a Talking Board - Ross E. Lockhart Shirley Jackson Amazon UK Amazon US
1: The Beauty of Death - Vol. 2: Death by Water: The Gargantuan Book of Horror Tales - Alessandro Manzetti, Jodi Renee Lester Bram Stoker Amazon UK Amazon US
1: The Best Science Fiction & Fantasy of the Year, Volume Eleven - Jonathan Strahan Locus Amazon UK Amazon US
1: The Year's Best Science Fiction: Thirty-Fourth Annual Collection - Gardner Dozois Locus Amazon UK Amazon US
1: Transcendent 2: The Year's Best Transgender Speculative Fiction - Bogi Takács Locus Amazon UK Amazon US
Tagged: Awards Literature Anthology/Collection
2018 Literature Award Database
2018 Science Fiction and Fantasy Novel Awards
2018 Science Fiction and Fantasy Novella Awards
2018 Science Fiction and Fantasy Novelette Awards
2018 Science Fiction and Fantasy Short Story Awards
2018 Science Fiction and Fantasy Anthology/Collection Awards