Science Fair Project Ideas has assembled a vast collection of science fair project ideas written by science teachers, professional scientists, and educational consultants on popular science fair topics ranging from physics and chemistry to biology and even sociology. We offer free science fair ideas suitable for every grade level, be it preschool, kindergarten, elementary school, middle school, or high school. Check the boxes in the sidebar to filter your results, or use the search bar to find that perfect science fair project or experiment your child will be sure to love.

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This science fair project idea explores what it takes to create a biosphere, or a self-sustaining ecosystem.
Sixth Grade
This science fair project idea explores the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.
Elementary School
Fourth Grade
This science fair project idea determines if mice and rats become aggressive when another mouse or rat is introduced into their territory.
Middle School
High School
In this fun elementary school science project learn the process of communication between insects and how ants communicate with one another to find their food.
Elementary School
Study the process of osmosis and determine how placing cells into hypotonic and hypertonic solutions affects osmosis in this middle school science project.
Middle School
Life Science
This science fair project idea teaches about the size of two different systems: the solar system and an atomic system.
Middle School
High School
This science fair project idea's objective is to understand the architecture and function of neurons and their key components.
Middle School

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