| Unit/Office | Directline | UP VOIP |
| UP Trunkline | 981 8500 981 8722 |
|
| CS Dean’s Office | 924 7674 924 7392 |
3801 | 3802 |
| CS Graduate Office | – – | 3803 |
| CS Secretary’s Office | 920 6093 | 3806 |
| CS Student & Public Affairs (ADSPA) | 927 3283 | 3805 |
| Science Society Program (SSP) | 435 6212 | 3809 |
| Material Science and Engineering Program (MSEP) | – – | 3812 |
| Research Extension and Facilities (ADREF) | – – | 3804 |
| Biology (IB) | 920 5471 | 3727 | 3728 |
| Chemistry (IC) | 920 5427 | 3652 | 3657 | 3661 |
| Computational Science (CSRC) | 426 3328 426 3329 |
4466 | 4467 |
| Environmental Science (IESM) | — | 3941 | 3942 |
| Geology (NIGS) | 924 2904 | 7116 | 7114 |
| Marine Science (MSI) | 922 3957 | 2907 |
| Mathematics | 920 1009 | 3858 | 3859 | 3861 |
| Molecular Biology & Biotechnology (NIMBB) | 927 7516 | 3958 | 3954 |
| Natural Sciences (NSRI) | 925 2963 | 3609 | 3612 |
| Physics (NIP) | 434 4243 | 3873 | 3874 |