- Online Math Courses, videos and lectures from leading universities. This has links to some excellent number theory courses.
- Lecture notes in Greek (Jannis Antoniadis)
- Number theory in the 17th and 18th centuries (ps 1281K)
- Elliptic curves (Mordell's theorem) (ps 1021K)
- L-series (ps 1953K)

- Algebraic Number Theory and commutative algebra, lecture notes by Robert Ash
- Lecture notes on p-adic numbers and introductory number theory (Andrew Baker)
- Algebraic number theory notes (Matt Baker - pdf)
- Cours d'arithmétique, notes by Pascal Boyer
- Zahlentheorie (Notes by Winfried Bruns)
- Algebra 2 - number theory for teacher education, Michal Bulant (in Czech)
- L-functions (lecture course by Kevin Buzzard)
- MAS4002: Algebraic Number Theory, Course notes by Robin Chapman, University of Exeter
- Algebraic Number Theory and Automorphic L-functions, lecture notes by Ching-Li Chai
- Curso avanzado de Teoría de Números (Fernando Chamizo)
- Lectures on irregularities of point distribution, (notes by William Chen)
- Elementary and Analytic Number Theory, Lecture notes by William Chen
- Math 4400/6400 - Number Theory (Pete Clark)
- Computational class field theory, A course given at the Middle East Technical University, Ankara, 1997 by Henri Cohen (dvi 255K)
- Draft chapters of elliptic curve handbook ECH1
- Modular forms (Igor Dolgachev)
- The Modular curves X
_{0}(N), Lecture notes by Bas Edixhoven - Lecture notes for Math 259: Introduction to Analytic Number Theory (Spring 1998) (Noam Elkies)
- Course notes for analytic number theory (Graham Everest) (ps 442K)
- Course Notes for elementary and algebraic number theory, local fields, Ivan Fesenko
- Math 780: Elementary Number Theory, Notes by Michael Filaseta, 1997
- Lectures on cryptography, Heraklion, Crete 2003, (Gerhard Frey)
- Vinogradov's three-primes theorem, notes by Timothy Gowers (dvi 54K)
*Elementary Number Theory*, by Peter Hackman (corrections and comments to the author at pehac@mai.liu.se)- Vorlesung Elementare Zahlentheorie mit Übungsblätter (Karin Halupczok)
- Lecture notes on algebraic number theory (Jerome Hoffman)
- Lecture notes on elementary number theory (Bruce Ikenaga)
- Math 254B (Number Theory), lecture notes on class field theory, abelian extensions of number fields etc (Kiran Kedlaya)
- 18.785: Analytic Number Theory (MIT, Spring 2007, Kiran Kedlaya)
- Cours de cryptographie, notes by Alain Kraus
- Algebraic Number Theory, Lecture Notes by Franz Lemmermeyer
*Quadratische Zahlkörper*, Lecture notes by Franz Lemmermeyer- Topics in Algebraic Geometry: Elliptic Curves, Lecture course by Franz Lemmermeyer
- Number theory lecture notes from Leiden University
- Seminar Notes on Elliptic Curves and Formal Groups: J. Lubin, J.-P. Serre and J. Tate, Summer Institute on Algebraic Geometry, Woods Hole, 1964
- Course notes in elementary number theory by Rudolph Maier (in Portuguese)
- Math 539, 2005, Lecture notes on analytic number theory by Greg Martin
- Introduction to number theory (MATH 4803/5803), lecture notes by Kimball Martin
- Number theory ii (MATH 6393), lecture notes on algebraic number theory by Kimball Martin
- Modular forms (MATH 6393), lecture notes by Kimball Martin
- MP313 and MP473 number theory course notes, problems and solutions by Keith Matthews
- Math 574 - A Graduate course in automorphic forms and representations (Stephen Miller)
- Course Notes by Jim Milne: Algebraic number theory, Class field theory, Algebraic Geometry, Elliptic Curves, Modular functions and forms, Abelian varieties, Etale Cohomology
- Elementare Zahlentheorie und Problemlösen, Herbert Möller
- DEA 2003/04: Elliptic functions and elliptic curves, lecture notes by Jan Nekovář
- MA3H1 Topics in Number Theory, Soma Purkait
- Maple Tutorial for Number Theory (Don Rideout)
- Vorlesungen über Zahlentheorie, Elliptische Kurven und Kryptographie, (Wolfgang Ruppert)
- Lecture notes on elementary number theory (David Santos)
- Draft of PCMI Lecture Notes on Open Questions in Arithmetic Algebraic Geometry (Alice Silverberg) (ps file 803K)
- Notes on additive combinatorics K. Soundararajan
- MA253, notes by Jeff Hoffstein of a first course in algebraic number theory given by Harold Stark
*Elementary Number Theory: Primes, Congruences, and Secrets*, William Stein, Undergraduate Text, Springer 2009 (freely available online)- Algebraic number theory course book (William Stein)
- Ken Ribet's Modular Forms and Hecke Operators Course (Notes by William A. Stein)
- Number rings, local fields, elliptic curves, lecture notes by Peter Stevenhagen
- Course notes on analytic number theory, algebraic number theory, linear forms in logarithms and diophantine equations (Cameron Stewart)
- Elliptische Kurven I/II, (Lecture notes in German by Michael Stoll)
- Introductory Number Theory (Course notes by Michael Stoll)
- Descent on Elliptic Curves (Course notes by Michael Stoll)
- Exercises on binary quadratic forms to supplement David Cox's book
*Primes of the Form x*(Jeff Stopple)^{2}+ny^{2} - Combinatorial and Analytic Number Theory, (Robert Tijdeman 2007)
- Math 7280, Fall 2004, elliptic curves (Helena Verrill)
- Math 7280, Spring 2004, modular forms (Helena Verrill)
- Diophantine geometry in characteristic p: a survey, (Felipe Voloch)
- Introduction to Diophantine methods: irrationality and transcendence, course notes by Michel Waldschmidt
- Cours de théorie des nombres, notes by Michel Waldschmidt
- Lecture notes on valuations and dynamics (Thomas Ward)
- The SlugMath Wiki, A mathematical resource at UC Santa Cruz created by Martin H. Weissman. Topics include basic number theory, quadratic residues
- Algebraic number theory course notes (Tom Weston)
- Notes on elementary number theory (David Wilkins)
- Vorlesungsmanuskripte und Übungen zur Zahlentheorie (Dieter Wolke)
*Circulants*, an online book by Alun Wyn-Jones- Introduzione alla Teoria Analitica dei Numeri, lecture notes by Alessandro Zaccagnini

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* Last modified 25th June 2014*