Welcome to William Diamond Middle School’s website. One of two middle schools in Lexington, Diamond offers a rich and interesting program of study in traditional academic subjects, physical education, the arts, and technology. We serve about 780 students, in grades 6, 7 and 8. We are proud to participate in the METCO Program, welcoming students from Boston as well as Lexington into our Diamond community.

This website is designed to give you access to a range of information about Diamond, and about your child’s current and future experiences here. Among other things, you will find information about departments and courses, and links to teacher web pages, as well as information about clubs and activities. We hope that you find it informative and easy to use. Welcome to Diamond! 


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  • Afterschool Club Signups
    Fall clubs start the week of October 6th. Last day to sign up is Friday, October 3rd. SIGN UP FOR A CLUB!

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  • Back-To-School Night is on Thursday, October 2 from 6:30-8:15.  Please carpool, walk, or bike.  Students will bring home paper copies of their schedules on Wednesday.  Parents who arrive early are asked to stay in the main lobby or cafeteria until teachers are ready at 6:25.
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  • Report Bullying
    If you or someone you know at Diamond is being bullied, report it online by using the form under Quick Links (left side of this page).
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  • Sentricon Info
    Click here to read more about the Sentricon Termite System installed at Diamond. While no termite activity has been noted, and no chemicals are currently being used, Massachusetts law requires us to notify parents about the treatment program in the event that the need arises. 
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