This collection of lesson plan sites is one of the largest on the Internet. So, it is best to visit several sites because content sometimes overlaps or lessons are too vague. Remember, it is always best to personalize lessons for your students' interests and levels.

And always feel free to share your own.

A to Z Lesson Plans

Africanized Honey Bee Lesson Plans
K-12 lesson plans; a printed version of these materials can also be purchased.

Algebra Online Lessons
Rice University and the Houston School District provide beginning algebra lesson plans developed by teachers.

Alliance to Save Energy Educator Lesson Plans

Anne Frank in the World, 1929-1945 Teacher Workbook
Provided by The Friends of Anne Frank in Utah and the Intermountain West Region, this workbook includes lesson plans and activities for grades 5-8 and 7-12, readings, overviews, timelines and a glossary.

Architecture:  Top 10 Free Lesson Plans & Activities

Awesome Library
Type subject in search section.

Baltimore Curriculum Project Lesson Plans
Explore lesson plans for primary grades.

Brock University Lesson Plans and Ideas Reference Sites

California History/Social Science Lessons

CanTeach
Canadian site with lessons for all subject areas - find lots of links and discussion lists.

Center for Civic Education Sample Lessons

CNNfyi.com
Site provides lessons by subject, with an emphasis on current events for each subject.

Columbia Education Center's Mini Lessons

Community Learning Network
Provides materials by subject

Core Knowledge Lesson Plans

Economic Education Web

Education World Lesson Planning Center
Search for lesson plans by discipline.

Educational Resources and Lesson Plans
Find thousands of lesson plans indexed by subject, as well as resources for educational history, learning theories and more.

Elementary Art Lesson Plans

Elementary Educators -- Lesson Plan Headquarters
Limited, but interesting

FunLessonPlans.com
Reading lessons include free printables, worksheets, story elements and games.

FunLessonPlans.com Preschool Lesson Plans

The Geometry Junkyard
Get geometry lesson plans and teaching materials.

History/Social Studies for K-12 Teachers
Large link site

Imagine the Universe Lesson Plans

Integrated Resource Packages
From British Columbia's Ministry of Education

In2Edu.com
Themes, integrated units/plans, rich topics and tasks

Kean University Hot Links for Middle Schoolers 
Resources for middle school teachers

Language Arts Lesson Plans

Learning Abilities Books Lesson Plans
Find lessons, Dolch books and puzzles, tips, children's and educators' books about LD.

Lesson Plan Central
More than 20,489 lesson plans

Lesson Plan for the Age of Imperialism

Lesson Plan Links
Huge link site with hundreds of lesson plan sites

Lesson Plan Search

Lesson Planet
You pay $10 or more for the site's services, although some resources are free. I recommend you take a look and remember the costs are tax deductible.

Lesson Plans and Resources for Social Studies Teachers
From Dr. Marty Levine, Professor Emeritus of Secondary Education

Lesson Plans 4 Teachers
A guide to online lesson plans for K-12 teachers

Lesson Plans on the Internet

LessonPlansPage.com

LessonPlanz.com

Marc Sheehan's Lesson Plans Page
Contains the author's original math lessons

Mark's ESL Cottage Lesson Plan Room

Mathematics Lesson Plans On Kayaking

Microsoft Education Instructional Resources
Very visual lesson plans for downloading

Mid-continent Research for Education and Learning

Mr. Donn's Lessons
Large listing with the emphasis on history

Multicultural Pavilion
Get lessons and activities, a reading list and information about a listserve for those interested in multicultural education.

New Deal Network Classroom Lesson Plans
Featured at the site are lesson plans for these New Deal topics: TVA: Electricity for All, Dear Mrs. Roosevelt, and Rondal Partridge NYA Photographer, among others.

New York Times Learning Network Teacher Connections

North Attleborough Public Schools

NTTI Lesson Plan Database
National Teacher Training Institute plans

PBS Teachers

Peterson's Classroom Lesson Plans & Themes
For early childhood educators who use thematic lesson planning

Physical Education Lesson Plan Page

Plan Book 2003-2004
View middle school science lesson plans and calendar.

Project Nom II Lesson Plans
Get plans on investigating exponential functions, graphing polar equations, maintaining a balanced aquarium, identifying and plotting coordinates, factoring polynomials and more.

Scholastic Teachers
Find lessons by topic and subject.

Science Lesson Plans
Over 200 science lesson plans

Science On-line Solar System Resource Toolkit

SMILE Program Chemistry Index

Social Studies/Geography Latin American lesson plans

Sports-Media
Lessons, tips, drills, activities and teaching aids for the physical education teacher

Tapperware Lesson Plan
Software for handheld computers lets teachers create, maintain and print lesson plans, so they can have this information with them to work on or refer to whenever it's convenient.

Teacher Created Materials

Teachers Helping Teachers
A significant number of lessons

TeachersFirst.com
Explore original content, Internet resources and lesson plans from around the world.

Teachers.Net Lesson Bank

TeacherVision.com Lesson Plans
Some pay requirements -- check what's free to see if it's worthwhile. I find it useful.

Teaching Ideas for Primary Teachers

Teaching Treasures Resource Links

Teach-Nology Lesson Plan Center

Technology Enhanced Curriculum Lesson Plans
From the Pinellas County Schools

ThemeDay.com
Try this collection of day-long thematic units. Included are lesson plans for all subject areas, printable worksheets, links to related sites and literature suggestions.

ThemeLink
Thematic lesson planning for early childhood educators

Yale-New Haven Teachers Institute
Site provides hundreds of lesson plans, many related to the environment, multicultural issues or literature.

Zaner-Bloser Lesson Plan Library