Vampires

Vampire Series books, click for reading order and release dates: 

Nightwalkers and ShadowDwellers
Warriors of Poseidon
Immortals After Dark
Atlantis 
Twilight Saga
Vampire Academy
House of Night
Evernight
Argeneau Vampires
Black Dagger Brotherhood
Dark-Hunters
The Dark series
Queen Betsy (Undead series) 
Vampire Diaries
Immortals  
Succubus Diaries
Embraced  
Southern Vampire series (AKA- True Blood)
Night Huntress 

Vampire Individual books:

Vamped by David Sosnoski- I love this book!
Highland Vampire anthology
His Immortal Embrace anthology
The Eternal Highlander by Hannah Howell & Lynsay Sands
My Immortal Highlander by Hannah Howell & Lynsay Sands
Highland Thirst by Hannah Howell & Lynsay Sands
Nature of the Beast anthology
Highland Beast anthology