There's some debate about the absolute strongest muscle in the human body, depending on how you define "strongest." Here are two contenders:
Masseter: This muscle is located in your jaw and is responsible for chewing. It's incredibly powerful, able to generate a force of up to 200 pounds (90.7 kilograms) on your molars.
Gluteus maximus: This is the large muscle in your buttocks. It's crucial for extension of the hip joint, allowing you to perform actions like standing, running, and jumping. While it might not exert the most concentrated force, its size and role in movement make it a strong contender.
So, the answer depends on whether you're looking at force per unit of mass (masseter) or overall contribution to movement (gluteus maximus).