Economics Textbook Recommendations

High School

 * Principles of Economics by Mankiw

Microeconomics

 * Intermediate Microeconomics with Calculus: A Modern Approach by Varian
 * Microeconomic Analysis by Varian

Macroeconomics

 * Macroeconomics by Mankiw
 * Advanced Macroeconomics by Romer

International Economics

 * International Economics: Theory and Policy by Krugman, Obstfeld, and Melitz

Money, Banking, and Financial Markets

 * The Economics of Money, Banking and Financial Markets by Mishkin
 * Money, Banking and Financial Markets by Ball

Econometrics
Basic Intermediate
 * Basic Econometrics by Gujarati
 * Introductory Econometrics: A Modern Approach by Wooldridge
 * Introductory Econometrics by Stock and Watson
 * Econometrics Analysis by Greene
 * A Course in Econometrics by Goldberger
 * Econometric Theory and Methods by Davidson and MacKinnon

Mathematical Finance

 * Options, Futures and Other Derivatives by Hull [Website and Errata]
 * Mathematics for Finance: An Introduction to Financial Engineering by Capinski and Zastawniak
 * Stochastic Calculus and Finance I: The Binomial Asset Pricing Model by Shreve
 * Stochastic Calculus Models for Finance II: Continuous Time Models by Shreve

Game Theory

 * Game Theory by Maschler, Solan, and Zamir

Social Choice Theory

 * Mathematics and Politics: Strategy, Voting, Power and Proof by Taylor and Pacelli

Graduate

 * Microeconomic Theory by Mas-Colell, Whinston, and Green
 * Recursive Macroeconomic Theory by Ljungqvist and Sargent
 * Econometrics by Hayashi
 * Estimation and Inference in Econometrics by Davidson and MacKinnon
 * Econometric Analysis of Cross Section and Panel Data by Wooldridge