Here are some recommendations across different genres, keeping in mind the wide range of interests a 14-year-old might have:
Fantasy:
* The Hunger Games trilogy by Suzanne Collins: A dystopian world with thrilling action, strong female characters, and thought-provoking themes.
* Divergent trilogy by Veronica Roth: A futuristic society divided into factions, where a young woman discovers she doesn't fit in.
* The Scorpio Races by Maggie Stiefvater: A thrilling story of a young woman who enters a dangerous horse race in a remote island.
* Six of Crows by Leigh Bardugo: A heist story with diverse characters and intricate world-building.
* A Court of Thorns and Roses by Sarah J. Maas: A romantic fantasy with a strong heroine and captivating world.
* Daughter of Smoke & Bone by Laini Taylor: A dark fantasy with compelling characters and a unique magical system.
Science Fiction:
* The Martian by Andy Weir: A suspenseful and witty story about an astronaut stranded on Mars.
* Ready Player One by Ernest Cline: A nostalgic and exciting adventure in a virtual reality world.
* The Hate U Give by Angie Thomas: A powerful young adult novel about a teenage girl who witnesses a police shooting and becomes an activist.
* The Book Thief by Markus Zusak: A moving and poignant story set in Nazi Germany told from the perspective of Death.
* The Absolutely True Diary of a Part-Time Indian by Sherman Alexie: A funny and honest story about a Native American teenager who goes to an all-white high school.
* The Giver by Lois Lowry: A classic dystopian novel about a boy who learns the truth about his society.
Contemporary:
* The Perks of Being a Wallflower by Stephen Chbosky: A coming-of-age story about a shy teenager who finds friendship and acceptance in high school.
* Eleanor & Park by Rainbow Rowell: A heartwarming and realistic story about two teenagers who fall in love.
* Simon vs. the Homo Sapiens Agenda by Becky Albertalli: A funny and insightful story about a closeted teenager who comes out and struggles with his identity.
* Aristotle and Dante Discover the Secrets of the Universe by Benjamin Alire Sáenz: A beautiful and heartwarming story about two teenage boys who form a special bond.
* Speak by Laurie Halse Anderson: A powerful story about a teenage girl who overcomes a traumatic experience.
* The Fault in Our Stars by John Green: A heartbreaking and moving story about two teenagers who fall in love while battling cancer.
Historical Fiction:
* The Book Thief by Markus Zusak: A moving and poignant story set in Nazi Germany told from the perspective of Death.
* Number the Stars by Lois Lowry: A powerful story about a young girl who helps her Jewish friend escape to safety during World War II.
* The Boy in the Striped Pajamas by John Boyne: A heartbreaking story about the friendship between a German boy and a Jewish boy during the Holocaust.
* Code Name Verity by Elizabeth Wein: A thrilling and suspenseful story about two spies during World War II.
* The Nightingale by Kristin Hannah: A moving story about two sisters who resist the Nazi occupation of France during World War II.
* Out of My Mind by Sharon Draper: A powerful story about a girl with cerebral palsy who fights for her right to be heard.
Mystery/Thriller:
* The Murderbot Diaries by Martha Wells: A humorous and thought-provoking science fiction series about a security robot who just wants to watch TV.
* The Last Mrs. Parrish by Liv Constantine: A twisty and suspenseful story about a woman who is determined to get revenge on the man who wronged her.
* Gone Girl by Gillian Flynn: A dark and suspenseful thriller about a husband who becomes the prime suspect in his wife's disappearance.
* The Girl on the Train by Paula Hawkins: A gripping and twisty psychological thriller about a woman who becomes obsessed with a couple she sees every day from her train window.
This list is just a starting point, and there are many other great books out there for 14-year-olds. It's important to consider the individual reader's interests and preferences when choosing a book.