Try search terms like "classroom observation" or the subject and/or grade you want to observe. A search might look like this: "classroom observation elementary math", or "preschool observation".
Choose a Subject, then try searching with the Categories feature. For example, Categories - Elementary - Math. Many of the videos are demonstrations as opposed to class observations.
Video hosting website. Look for the Search box. Use terms like "elementary math". Consider applying limits, on the left, such as Duration - Long and Price - Free.
The video library includes classroom observations and allows users to limit by grade level, subject area and Common Core Standards. Videos range in length from short 5 minute clips to longer views of lessons up to 40 minutes. From the New York State Department of Education.
Annenberg Learner funds and distributes educational video programs for the professional development of K-12 teachers. Choose a grade level and subject. Choose a course. Classroom Case Studies can help you observe a class.
Try choosing Video Library - Subject - Grade. This site is listed last because there is a subscription after viewing three videos. Hopefully you can get what you need from the other resources.
This video library hosts more than 50 videos focused on early childhood education. Select categories from tabs at the top. This site is under the direction of the California Department of Education.
Try scrolling to the bottom and looking through the pages of 154 videos. Look for videos that show teachers interacting with children. The videos are short.