| Departments |
| Subjects provided at ISH are divided into Deparments. The Departments and the Department Heads can be found from below. |
| Primary Years Programme (PYP) Departments |
| Coordinator: Neil O’Toole |
| Homeroom K1 - Grade 2 |
| Maria Amelia Mello |
| Homeroom Grade 3 - Grade 5 |
| Chess Gunderson and Bridget Emery |
| Special Needs |
| Jessica Spector |
| Technology |
| Kirsi Tapola |
| Library |
| Inga-Britt Jäske |
| English as Second Language (ESL) |
| Kris Alho |
| Finnish Mother Tongue |
| Kaija Bergman |
| Finnish Foreign Language |
| Pertti Setälä |
| French Foreign Language |
| Neil O'Toole |
| Music |
| Leslie Maslow-Jauhiainen |
| Physical Education |
| Eva Torstila |
| Middle Years Programme (MYP) Departments |
| Coordinator: Andrew Mitchell |
| Language A |
| Mark Kilmer |
| Humanities |
| Jyri-Pekka Komonen |
| Technology |
| Carl Love |
| Mathematics |
| Andrew Mitchell |
| Music |
| Leslie Maslow-Jauhiainen |
| Arts |
| Monica Joensuu |
| Sciences |
| Andrew Mitchell |
| Physical Education and Health |
| Jonne Karanko and Siw Sandell |
| Language B |
| Minna Tammivuori-Piraux |
| English as Second Language (ESL) |
| Brian Rasmussen |
| Counseling |
| Jessica Spector |
| International Baccalaureate Diploma (IBD) Coordination |
| Coordinator: Brian Ellum |
| Group 1 - Language A1 |
| Mark Kilmer |
| Group 2 - Language B |
| Minna Tammivuori-Piraux |
| Group 3 - Individuals and Societies |
| Jyri-Pekka Komonen |
| Group 4 - Experimental Sciences |
| Andrew Mitchell |
| Group 5 - Mathematics and Computer Science |
| Brian Ellum |
| Group 6 - The Arts |
| Monica Joensuu |
| Administration |
 Board of Governors |
| Headmaster |
| Principals |
| Coordinators |
