No, Earth is not an exoplanet. An exoplanet, or extrasolar planet, is a planet that orbits a star outside of our solar system. Earth is part of our solar system, orbiting the Sun, which makes it a planet, but not an exoplanet.
To further clarify, exoplanets are typically detected by observing their effect on their parent star or through direct imaging methods. Since Earth is one of the eight planets that directly orbit the Sun, it does not fall into the category of exoplanets.