| Serangoon Garden Secondary School | |
| Native Name: | 实勤中学 |
| Location: | 21 Serangoon North Avenue 1, Singapore 555889 |
| Coordinates: | 1.3698°N 103.8672°W |
| Motto: | What SGSians Do |
| Type: | Government |
| Session: | Single |
| Enrolment: | 1350 |
| Principal: | Patsy Ong |
| Homepage: | sgs.moe.edu.sg |
Serangoon Garden Secondary School (SGS) is a co-educational government secondary school located in Serangoon, Singapore.
Serangoon Garden Secondary School was founded in 1959 as Lichfield Secondary School at Lichfield Road in Serangoon.
In 1969, the school absorbed the neighbouring school, Hwi Yoh Vocational School, and in 1970, became Serangoon Garden Secondary School. It became a bilingual secondary school with both English and Chinese streams, with facilities for the teaching of academic, technical and commercial subjects. In 1984, it became a purely English stream school with the last batch of Chinese stream graduating in the same year. The school moved to its current premises in 2004.