A key component of any yoga path is self-study, or svadhyaya. Reading texts can much enhance your ability to be an intelligent, intentional practitioner. In addition to reading for education and furthering my practice, reading fiction for pleasure is a passion of mine and I've included some of my favorites below.

Yoga philosophy
The Yoga Sutras by Edwin Bryant
Light on the Yoga Sutras by BKS Iyengar
The Upanishads by Eknath Easwaran
The Bhagavad Gita by Eknath Easwaran OR
The Bhagavad Gita As It Is
Health, Healing, and Beyond by TKV Desikachar
The Heart of Yoga by TKV Desikachar
The Tree of Yoga by BKS Iyengar
Freud and Yoga by TKV Desikachar and Hellfried Krusche

Light on Yoga by BKS Iyengar
Yoga a Gem for Women by Geeta Iyengar
Insight Yoga by Sarah Powers (Yin)
Yoga the Iyengar Way by Silva, Mira, and Shyam Mehta
Relax and Renew: Restful Yoga for Stressful Times by Judith Lasater (Restorative) 
The Woman's Book of Yoga and Health by Linda Sparrowe et al.

Living a spiritual life
My Body is a Temple by Christina Sell
The Journey Home by Radhanath Swami
 Light on Life by BKS Iyengar
The Journey Within by Radhanath Swami

The Yoga of Breath by Richard Rosen
Light on Pranayama by BKS Iyengar

Yoga History
The Yoga Tradition: Its History, Literature, Philosophy and Practice by Georg Feuerstein
Goddess Pose by Michelle Goldberg
Yoga Body by Mark Singleton

Anatomy of Movement by Blandine Calais-Germain
The Key Muscles of Yoga by Ray Long
Yoga Body by Judith Lasater
Yoga Anatomy by Leslie Kaminoff
Anatomy of Hatha Yoga by H. David Coulter

The Courage to Teach by Parker J. Palmer
Teaching Yoga by Donna Farhi

Mantras and Meditation
Healing Mantras by Thomas Ashley Farrand
Shakti Mantras by Thomas Ashley Farrand
How to Meditate by Pema Chodron
Journey of Awakening by Ram Dass

American Pastoral by Philip Roth
The Goldfinch by Donna Tartt
White Noise by Don Delillo
The Corrections by Jonathan Franzen
Midnight's Children by Salman Rushdie
The Namesake by Jhumpa Lahiri
The Handmaid's Tale by Margaret Atwood
The Guernsey Literary and Potato Peel Pie Society by Annie Barrows et al.
Shantaram by Gregory David Roberts
The Remains of the Day by Kazuo Ishiguro
The Unbearable Lightness of Being by Milan Kundera
The Wind-Up Bird Chronicle by Haruki Murakami
The Poisonwood Bible by Barbara Kingsolver
A Heartbreaking Work of Staggering Genius by Dave Eggers
Extremely Loud and Incredibly Close by Jonathan Safran Foer

Lord Krishna's Cuisine: The Art of Indian Vegetarian Cooking by Yamuna Devi
Plenty by Yotam Ottolenghi
Super Natural Every Day by Heidi Swanson
Jerusalem by Yotam Ottolenghi et al.