Course Notes by Jim Milne: Algebraic number theory, Class field theory, Algebraic Geometry, Elliptic Curves, Modular functions and forms, Abelian varieties, Etale Cohomology.
Math 574 - A Graduate course in automorphic forms and representations (Stephen Miller).
Theory of Numbers, lecture notes by Yotsanan Meemark.
Modular forms (MATH 6393), lecture notes by Kimball Martin.
Number theory ii (MATH 6393), lecture notes on algebraic number theory by Kimball Martin.
Introduction to number theory (MATH 4803/5803), lecture notes by Kimball Martin.
Math 539, 2005, lecture notes on analytic number theory by Greg Martin.
Course notes in elementary number theory by Rudolph Maier (in Portuguese).
Exploring Number Theory, a blog on elementary number theory by Dan Ma.
Tate, Summer Institute on Algebraic Geometry, Woods Hole, 1964
Seminar Notes on Elliptic Curves and Formal Groups: J.
Number theory lecture notes from Leiden University.
Topics in Algebraic Geometry: Elliptic Curves, lecture course by Franz Lemmermeyer.
Quadratische Zahlkörper, lecture notes by Franz Lemmermeyer.
Algebraic Number Theory, lecture Notes by Franz Lemmermeyer.
Cours de cryptographie, notes by Alain Kraus.
18.785: Analytic Number Theory (MIT, Spring 2007, Kiran Kedlaya).
Math 254B (Number Theory), lecture notes on class field theory, abelian extensions of number fields etc (Kiran Kedlaya).
Number Theory lecture notes (Eugen Ionascu).
lecture notes on elementary number theory (Bruce Ikenaga).
lecture notes on algebraic number theory (Jerome Hoffman).
Azar y Aritmética (a course on probabilistic number theory by Harald Helfgott).
Elementary Number Theory, by Peter Hackman.
Curves over finite fields, Richard Griffon.
Fall 2012-Math 201 Elementary Number Theory, Aaron Greicius.
Vinogradov's three-primes theorem, notes by Timothy Gowers (dvi 54K).
lectures on cryptography, Heraklion, Crete 2003, (Gerhard Frey).
Math 780: Elementary Number Theory, Notes by Michael Filaseta, 1997.
Course Notes for elementary and algebraic number theory, local fields, Ivan Fesenko.
lecture notes for Math 259: Introduction to Analytic Number Theory (Spring 1998) (Noam Elkies).
The Modular curves X 0(N), lecture notes by Bas Edixhoven.
Draft chapters of elliptic curve handbook ECH1 (Ian G.
Computational class field theory, A course given at the Middle East Technical University, Ankara, 1997 by Henri Cohen (dvi 255K).
Math 4400/6400 - Number Theory (Pete Clark).
Curso avanzado de Teoría de Números (Fernando Chamizo).
Algebraic Number Theory and Automorphic L-functions, lecture notes by Ching-Li Chai.
Number Theory 2013-2014, Course notes by Robin Chapman, University of Exeter.
MAS4002: Algebraic Number Theory, Course notes by Robin Chapman, University of Exeter.
A course in number theory (Peter Cameron).
L-functions (lecture course by Kevin Buzzard).
Algebra 2 - number theory for teacher education, Michal Bulant (in Czech).
Zahlentheorie (Notes by Winfried Bruns).
Cours d'arithmétique, notes by Pascal Boyer.
Algebraic number theory notes (Matt Baker - pdf).
lecture notes on p-adic numbers and introductory number theory (Andrew Baker).
Algebraic Number Theory and commutative algebra, lecture notes by Robert Ash.
This has links to some excellent number theory courses.
Online Math Courses, videos and lectures from leading universities.
Number Theory - Summer School aimed at undergraduate students Lisbon, July 11-15, 2011.
Online number theory lecture notes and teaching materials Online number theory lecture notes and teaching materials