These are books originally published in the US that were also published via UK or Australian publishers, listed by publisher:

Australia

Bloomsbury Australia

• The Gravity of Us by Phil Stamper (Booktopia | Dymocks | QBD)
• As Far As You’ll Take Me by Phil Stamper (Booktopia | Dymocks | QBD)
• Golden Boys by Phil Stamper (Booktopia | Dymocks | QBD)

UK

Andersen Press

• The Taking of Jake Livingston by Ryan Douglass

Bloomsbury UK

• The Gravity of Us by Phil Stamper (Amazon | Waterstones | Foyles)
• As Far As You’ll Take Me by Phil Stamper (Amazon | Waterstones | Foyles)
• Golden Boys by Phil Stamper (Amazon | Waterstones | Foyles)

Egmont

• Two Boys Kissing by David Levithan

Faber & Faber

• Highly Illogical Behavior by John Corey Whaley

HarperCollins

• How to Excavate a Heart by Jake Maia Arlow
• The Kindred by Alechia Dow
• A Million to One by Adiba Jaigirdar
• Extasia by Clare Legrand
• Boy Meets Boy by David Levithan
• Lies We Tell Ourselves by Robin Talley

Hodder

• If This Gets Out by Cale Dietrich and Sophie Gonzales
• Only Mostly Devastated by Sophie Gonzales
• Perfect on Paper by Sophie Gonzales
• Never Ever Getting Back Together by Sophie Gonzales
• Ash by Malinda Lo
• Last Night at the Telegraph Club by Malinda Lo
• The Ones We Burn by Becca Mix
• Girls of Paper and Fire by Natasha Ngan
• The Coldest Touch by Isabel Sterling
• Court of the Undying Seasons by A.M. Strickland

Hot Key Books

• This Book is Gay by Juno Dawson

Macmillan

• You Know Me Well by David Levithan and Nina LaCour
• Carry On by Rainbow Rowell
• Fans of the Impossible Life by Kate Scelsa

Penguin

• Simon vs. the Homo Sapiens Agenda by Becky Albertalli
• Leah on the Offbeat by Becky Albertalli
• The Miseducation of Cameron Post by Emily Danforth
• Will Grayson, Will Grayson by John Green and David Levithan
• Jack of Hearts (and other parts) by L.C. Rosen

Scholastic UK

• Hurricane Child by Kacen Callender
• Fire Becomes Her by Rosiee Thor

Simon & Schuster Children’s UK

• What If It’s Us? by Becky Albertalli and Adam Silvera
• More Happy Than Not by Adam Silvera
• History is All  You Left Me by Adam Silvera
• They Both Die at the End by Adam Silvera
• Infinity Son by Adam Silvera
• Odd One Out by Nic Stone

Titan

• At Midnight ed. by Dahlia Adler

Usborne

• If I Was Your Girl by Meredith Russo
• Birthday by Meredith Russo

Walker

• I’ll Give You the Sun by Jandy Nelson
• Release by Patrick Ness