# Courses **Spring 2026** - [​​​​​CS2252: Spectral Graph Theory in Computer Science](https://sites.google.com/g.harvard.edu/sgt) - [CS2253: Seminar on Pseudorandomness and High-Dimensional Expansion](https://canvas.harvard.edu/courses/163625) - [CS1240: Data Structures and Algorithms](https://docs.google.com/spreadsheets/d/1ov0_XA-R7pJLknGEpxLhcoc1x-WmHTAsnHWHA2nLwMI/edit?gid=0#gid=0) - [CS2824: Foundations of Reinforcement Learning](https://beta.my.harvard.edu/course/COMPSCI2824/2026-Spring/001) ### Past Courses expand\_more [Additive Combinatorics (Lecturer Ben Green) (Fall 2009, one-time course)](http://people.maths.ox.ac.uk/greenbj/) [AM 106/206. (Advanced) Applied Algebra](http://www.courses.fas.harvard.edu/3871) [AM 106/206. Applied Algebra.](http://people.seas.harvard.edu/~madhusudan/courses/Fall2016/) [AM 107. Graph Theory and Combinatorics](http://isites.harvard.edu/course/colgsas-6411) [AM 221. Advanced Optimization](http://people.seas.harvard.edu/~yaron/AM221/) [AM/ES 121. Introduction to Optimization: Models and Methods](http://am121.seas.harvard.edu/) [CS 121. Introduction to the Theory of Computation](https://canvas.harvard.edu/courses/4896) [CS 121. Introduction to the Theory of Computation](http://lewis.seas.harvard.edu/pages/computer-science-121-and-csci-e-121-introduction-theory-computation) [CS 124. Data Structures and Algorithms](http://sites.fas.harvard.edu/~cs124/) [CS 125. Algorithms and Complexity](https://coursecatalog.harvard.edu/icb/icb.do?keyword=CourseCatalog&panel=icb.pagecontent695860%3Arsearch%3Ffq_coordinated_semester_yr%3D%26fq_school_nm%3D%26q%3DCS%2B125%26sort%3Dcourse_title%2Basc%26start%3D0%26submit%3DSearch&pageid=icb.page335057&pageContentId=icb.pagecontent695860&view=detail&viewParam_q=id%3Ad_colgsas_2015_1_156210_001&viewParam_returnUrl=search%3Fq%3DCS%2520125%26sort%3Dcourse_title%2520asc%26start%3D0%26rows%3D25#a_icb_pagecontent695860) [CS 125. Algorithms and Complexity.](http://people.seas.harvard.edu/~cs125/) [CS 127. Introduction to Cryptography](http://www.boazbarak.org/cs127/index.html) [CS 136. Economics and Computation](https://sites.google.com/g.harvard.edu/cs136/home) [CS 221. Computational Complexity](http://people.seas.harvard.edu/~salil/cs221/) [CS 222. Algorithms at The End of the Wire (Fall 2012)](http://www.courses.fas.harvard.edu/2493) [CS 222. Algorithms at the End of the Wire.](http://www.eecs.harvard.edu/~michaelm/CS222/syllabus.html) [CS 223. Probabilistic Analysis and Algorithms (Spring 2015)](http://www.courses.fas.harvard.edu/4740) [CS 224. Advanced Algorithms (Fall 2014)](http://people.seas.harvard.edu/~minilek/cs224/index.html) [CS 225. Pseudorandomness (Spring 2015)](http://eecs.harvard.edu/~salil/cs225) [CS 225. Pseudorandomness.](http://people.seas.harvard.edu/~salil/cs225/index.html) [CS 226r. Efficient Algorithms (Fall 2010)](http://www.courses.fas.harvard.edu/1749) [CS 227r. Topics in Cryptography and Privacy (Differential Privacy) (Fall 2014)](http://isites.harvard.edu/icb/icb.do?keyword=k106734) [CS 228. Computational Learning Theory (Spring 2014)](http://www.courses.fas.harvard.edu/0364) [CS 229r. Proofs, Beliefs, and Algorithms through the lens of Sum of Squares](http://www.boazbarak.org/) [CS 229r. Topics in the Theory of Computation (Algorithms for Big Data)](http://people.seas.harvard.edu/~minilek/cs229r/index.html) [CS 229r. Topics in the Theory of Computation (Biology and Complexity) (Spring 2015)](http://www.courses.fas.harvard.edu/3730) [CS 229r. Topics in the Theory of Computation (Mathematical Approaches to Data Privacy) (Spring 2013)](http://people.seas.harvard.edu/~salil/diffprivcourse/spring13/) [CS 229r: Information Theory in Computer Science](http://madhu.seas.harvard.edu/courses/Spring2016/) [CS 284r. Topics on Computation in Networks and Crowds (Social Data Mining) (Fall 2014)](http://people.seas.harvard.edu/~yaron/SocialDataMining/index.html) [CS 285. Multi-Agent Systems (Fall 2013)](http://www.seas.harvard.edu/courses/cs285/CS_285/Course_Home.html) [CS 286r. Topics at the Interface between Computer Science and Economics (Computational Social Choice) (Fall 2011)](http://www.eecs.harvard.edu/cs286r/courses/fall11/index.html) [CS 286r. Topics at the Interface between Computer Science and Economics (Information, Prediction, and Collective Intelligence) (Fall 2012)](http://www.eecs.harvard.edu/cs286r/courses/fall12/index.html) [CS 286r. Topics at the Interface between Computer Science and Economics (Matching and Market Design) (Spring 2014)](http://www.immorlica.com/marketDesign/Harvard/index.html) [ES 250. Information Theory](https://canvas.harvard.edu/courses/6182) [MATH 116. Real Analysis, Convexity, and Optimization (Fall 2013)](http://www.courses.fas.harvard.edu/5253) [MATH 141. Introduction to Mathematical Logic](http://isites.harvard.edu/course/colgsas-0600) [MATH 152: Discrete Mathematics](https://canvas.harvard.edu/courses/3965) [MATH 155r. Combinatorics](http://www.courses.fas.harvard.edu/6612) [MATH 162. Introduction to Quantum Computing (Spring 2011)](http://www.courses.fas.harvard.edu/93376) [MATH 168. Computability Theory (Spring 2013)](http://www.courses.fas.harvard.edu/31297) [MATH 253. Introduction to Computability and Randomness (Spring 2011)](http://www.courses.fas.harvard.edu/67781) [MATH 256x. The Theory of Error-Correcting Codes (Fall 2013)](http://www.math.harvard.edu/~elkies/M256.13/index.html) [MATH 268x. Graph Limits (Fall 2011)](http://www.courses.fas.harvard.edu/12792) [MATH 270. Advanced Probability Theory (Fall 2011)](http://www.courses.fas.harvard.edu/44129) [MATH 276. Expander Graphs and Number Theory (Spring 2009)](http://www.courses.fas.harvard.edu/7737) [MATH 298. Random Matrices (Spring 2012)](http://www.courses.fas.harvard.edu/38719) [CS126: Fairness and Privacy: Perspectives from Law and Probability](https://hls.harvard.edu/courses/fairness-and-privacy-perspectives-of-law-and-probability-2/) [CS224: Algorithms for Data Science](https://sitanchen.com/cs224/f24/index.html) CS237: Economic Analysis as a Frontier of Theoretical Computer Science