课外活动是指在课余时间由教育机构或学生的知识和提升其能力，及向他们提供娱乐、德育或练习。在香港，课外活动的范围十分广泛，大致可以分为五大类：学术性、服务性、兴趣性、艺术性及体育性，各有不同的作用，学生可以按照自己的兴趣、时间、能力等选择。

Extracurricular activities or Extra Academic Activity (EAA) are those that fall outside the realm of the normal curriculum of school or university education, performed by students. Extracurricular activities exist for all students. And generally, volunteer activities aren't always extracurricular activities.