This book is an Introductory text in quantum mechanics. It is part of the Oxford Physics Series. The introduces quantum mechanics by first summarising the deficiencies in the classical scheme. The material is developed alongside the required mathematics which makes the book more or less self contained. The mathematical digressions cover hermitian matrices, vectors, and differential equations in sufficient detail to follow the text. A more general text may be required for those with a less robust mathematical background. Chapter Titles: 1. Basics 2. Observables 3. Equations of Motion 4. Quantum Particles in one Dimension: Basics 5. Quantum Particles in One Dimension: Some Examples. 6. Quantum Particles in Three Dimensions 7. The Stern Gerlach Effect and the Spin of the Electron 8. A Quantum Particle in a Spherically Symmetric Potential 9. The Bound States of the Hydrogen Atom 10. The Dirac Notation 11. Harmonic Motion 12. Eigenvalue Perturbation Theory 13. Eigenvalue Perturbation Theory: The degenerate case 14. Time Dependent Perturbation Theory: 15. Electric Dipole Radiation 16. Variational Approximations 17. Variational Approximations: Two Realistic Applications 18. Experience is the enemy of intuition The book also contains a good range of examples and problems spread throughout the text (no solutions given)