A wavelength conversion module, includes a wavelength conversion device and at least one heat dissipation airflow providing device. The wavelength conversion device has at least one side surface. The heat dissipation airflow providing device has an outlet, wherein the outlet faces the side surface, and the heat dissipation airflow providing device is adapted to provide a heat dissipation airflow to the side surface from the outlet. A distance between a geometry center of an orthogonal projection of the outlet on the side surface and a geometry center of the side surface is smaller than or equal to half of a maximum inner diameter of the outlet. In addition, a projector having the wavelength conversion module is also provided.