| IB Results Release | 05 Jan |
| Y1 – IB1 School Camp | 07 Jan – 08 Jan |
| Y1 Induction Ceremony | 15 Jan |
| IGCSE Results Release | 19 Jan |
| Chinese New Year Celebration | 11 Feb |
| Hwa Chong Founders Day Prize-Giving Ceremony | 12 Mar |
| HCIS Open House | 27 Mar |
| TEDx Youth and TOK Seminars | 15 April |
| Y1 – IB1 Mid-Year Examinations | 29 Apr – 10 May |
| Y1 – Y4 Sabbatical Programme | 17 May – 25 May |
| Y1 – IB2 Parent-Teacher Interaction | 28 May |
| Blood Donation Drive | 06 July |
| IB2 Mid-Year Examinations | 28 Jun – 02 Jul |
| HCIS Model United Nations | 02 Jul – 03 Jul |
| Y5 – Y6 University Fair | 14 Jul |
| IB1 – IB2 Parent-Teacher Interaction | 23 Jul |
| The Voice of HCIS | 05 Aug |
| HCIS Gives Back | 06 Aug |
| Y1 – Y4 Parent-Teacher Interaction | 20 Aug |
| Y4 (IGCSE) Preliminary Examinations | 23 Aug – 01 Sep |
| IB2 Preliminary Examinations | 30 Aug – 01 Sep, 13 Sep – 24 Sep |
| Teachers’ Day Celebration | 02 Sep |
| IB1 End-of-Year Examinations | 13 Sep – 24 Sep |
| IGCSE Commencement Day | 05 Oct |
| Y4 (IGCSE) Examinations | 06 Oct – 16 Nov |
| IB Graduation | 08 Oct |
| IB Examinations | 25 Oct – 10 Nov |
| Y1 – 4 End-of-Year Examinations | 25 Oct – 12 Nov |
| IB1 CAS Day | 5 Nov |
| Examination Marking Day | 8 Nov – 9 Nov |
| Examination Admin Day | 11 Nov – 12 Nov |
| InnoFest | 17 Nov |
