| IB Results Release | 03 Jan |
| Y1 – IB1 School Camp | 04 – 05 Jan |
| Y1 Induction Ceremony | 12 Jan |
| IGCSE Results Release | 18 Jan |
| Chinese New Year Celebration | 8 Feb |
| Lohei Lunch | 23 Feb |
| School Collaboration | 26 Feb |
| Y1 Parent-Teacher Interaction | 29 Feb |
| Hwa Chong Founders’ Day Prize-Giving Ceremony | 8 Mar |
| HCIS Open House | 06 Apr |
| Y1 – IB1 Mid-Year Examinations | 22 Apr – 03 May |
| Y1 – Y4 Sabbatical Programme / Internationalism Trips | 13 May – 23 May |
| Y1 – IB2 Parent-Teacher Interaction | 24 May |
| Experiential Camp | 27 May |
| IB2 Mid-Year Examinations | 24 Jun – 28 Jun |
| The Voice of HCIS | 31 Jul |
| HCIS Gives Back | 08 Aug |
| Y4 (IGCSE) Preliminary Examinations | 13 Aug – 28 Aug |
| Y1 – IB2 Parent-Teacher Interaction | 16 Aug |
| IB2 Preliminary Examinations | 26 Aug – 28 Aug, 09 Sep – 20 Sep |
| Teachers’ Day Celebration | 29 Aug |
| IB1 End-of-Year Examinations | 09 Sep – 20 Sep |
| IGCSE Graduation Ceremony | 01 Oct |
| IB2 Graduation Ceremony | 04 Oct |
| IB Examinations | TBC |
| Y1 – Y4 End-of-Year Examinations | 17 Oct – 30 Oct |
| Innofest | 12 Nov |
