| DATE | ISN | TYPE | SHORT TITLE | IMG | SCO | NGO |
| 1998.02.14 |
A1998B14 | COM | 50th Anniv. Art Assoc. of the Phils. |
IMG | - o - | 2463-2464 |
| 1998.02.25 |
A1998B25.1 | COM | Centennial of Club Filipino |
IMG | - o - | 2465 |
| 1998.02.25 |
A1998B24.2 | COM | Centenary of Blsd. Marie Eugene |
IMG | - o - | 2466 |
| 1998.02.25 |
A1998B24.3 | COM | 50th Anniv. of Fulbright Comm. |
IMG | - o - | 2467 |
| 1998.03.03 |
A1998C03 | DEF | Heroes of Revolution [Series I] |
IMG | - o - | 2468 |
| 1998.03.20 |
A1998C20 | COM | 50th Anniv. of Apo View Hotel |
IMG | - o - | 2469 |
| 1998.03.24 |
A1998C24 | DEF | Heroes of Revolution [Series II] |
IMG | - o - | 2470-2472 |
| 1998.04.30 |
A1998D30 | DEF | Heroes of Revolution [Series III] |
IMG | - o - | 2473 |
| 1998.05.05 |
A1998E05.1 | COM | Centenary of Philippine Navy |
IMG | - o - | 2474 |
| 1998.05.05 |
A1998E05.2 | COM | 75th Anniv. of Phil Cultural High School |
IMG | - o - | 2475 |
| 1998.05.05 |
A1998E05.3 | COM | 75th Anniv. of V.Mapa High School |
IMG | - o - | 2476 |
| 1998.05.07 |
A1998E07.1 | COM | 50th Anniv. of the Univ. of Baguio |
IMG | - o - | 2477 |
| 1998.05.07 |
A1998E07.2 | COM | 50th Anniv. of PMI |
IMG | - o - | 2478 |
| 1998.05.18 |
A1998E18 | COM | Heroes of Revolution [Series IV] |
IMG | - o - | 2479-2481 |
| 1998.05.22 |
A1998E22 | SPE | World Expo '98, Lisbon, Portugal |
IMG | - o - | 2482-2483 |
| 1998.05.22 |
S1998E22 | S-S | World Expo '98, Lisbon, Portugal |
IMG | - o - | 2484 |
| 1998.05.28 |
A1998E28 | COM/M-S | Clark Special Economic Zone |
IMG | - o - | 2485 |
| 1998.05.29 |
A1998E29 | DEF M-S | Flowers of the Philippines |
IMG | - o - | 2486-2493 |
| 1998.05.29 |
S1998E29 | S-S | Flowers of the Philippines |
IMG | - o - | 2494 |
| 1998.06.01 |
A1998F01 | COM | Decade of Filipino Nat'lism [Series X] |
IMG | - o - | 2495-2499 |
| 1998.06.03 |
A1998F03 | COM/M-S | Century of Friendship with Spain & Mexico |
IMG | - o - | 2500-2502 |
| 1998.06.03 |
S1998F03 | S-S | Century of Friendship with Spain & Mexico |
IMG | - o - | 2500-2502S |
| 1998.06.03 |
S1998F03.1 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2504 |
| 1998.06.03 |
S1998F03.2 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2505 |
| 1998.06.03 |
S1998F03.3 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2506 |
| 1998.06.03 |
S1998F03.4 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2507 |
| 1998.06.03 |
S1998F03.5 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2508 |
| 1998.06.03 |
K1998F03 | COM/B-K | Phil. Centennial Prestige |
IMG | - o - | 2504-2508 |
| 1998.06.09 |
A1998F09 | COM | Centenary of Phil Independence [NCC Series V] |
IMG | - o - | 2509-2511 |
| 1998.06.12 |
A1998F12 | DEF | Flag with Natl Symbols [Series XVII] |
IMG | - o - | 2513-2526 |
| 1998.06.12 |
S1998F12 | S-S | Centenary of Phil. Independence SS Series VI |
IMG | - o - | 2512 |
| 1998.06.19 |
M1998F19 | DEF/M-S | Inter'l Year of the Ocean '98 Series I |
IMG | - o - | 2527-2546 |
| 1998.06.19 |
S1998F19 | S-S | Inter'l Year of the Ocean '98 Series I |
IMG | - o - | 2547 |
| 1998.06.19 |
A1998F19 | DEF | Piso Para sa Pasig Project |
IMG | - o - | 2548 |
| 1998.07.07 |
A1998G07 | DEF | Flag with Natl Symbols [Series XVIII] |
IMG | - o - | 2549 |
| 1998.07.20 |
A1998G20 | DEF | Heroes of Revolution [Series V] |
IMG | - o - | 2550-2551 |
| 1998.10.09 |
A1998J09.1 | COM | Centennial of Phil Coconut Industry |
IMG | - o - | 2552 |
| 1998.10.09 |
A1998J09.2 | COM | 75th Anniv. Foundation of Holy Spirit Adoration |
IMG | - o - | 2553 |
| 1998.10.24 |
A1998J24.1 | COM | 50th Anniv. of Decl. of Human Rights |
IMG | - o - | 2554 |
| 1998.10.24 |
A1998J24 | DEF/M-S | Inter'l Year of the Ocean '98 Series II |
IMG | - o - | 2555 |
| 1998.10.24 |
S1998J24 | S-S | Inter'l Year of the Ocean '98 Series II |
IMG | - o - | 2556 |
| 1998.11.04 |
A1998K04 | COM/M-S | Centenary of Phil Postal Service |
IMG | - o - | 2557-2560 |
| 1998.11.04 |
S1998K04 | S-S | Centenary of Phil Postal Service |
IMG | - o - | 2561 |
| 1998.11.05 |
A1998K05 | DEF | Christmas 1998 [Lanterns] |
IMG | - o - | 2562-2565 |
| 1998.11.05 |
S1998K05 | S-S | Pilipinas'98, Series I |
IMG | - o - | 2566 |
| 1998.11.06 |
S1998K06 | S-S | Pilipinas'98, Series II |
IMG | - o - | 2569 |
| 1998.11.07 |
S1998K07 | S-S | Pilipinas'98, Series III |
IMG | - o - | 2570 |
| 1998.11.08 |
S1998K08 | S-S | Pilipinas'98, Series IV |
IMG | - o - | 2571 |
| 1998.11.09 |
S1998K09 | S-S | Pilipinas'98, Series V |
IMG | - o - | 2572 |
| 1998.11.061 |
A1998K06.1 | SPE | Philippine Shells |
IMG | - o - | 2573-2576 |
| 1998.11.061 |
S1998K06.1 | S-S | Philippine Shells |
IMG | - o - | 2581 |
| 1998.11.10 |
A1998K10 | DEF | Inaug. of Pres. Joseph Estrada |
IMG | - o - | 2583-2584 |
| 1998.11.20 |
S1998K20 | S-S | Philippine Pride Souvenir Sheets |
IMG | - o - | 2585-2590 |
| 1998.11.25 |
A1998K25 | COM | Stamp Collecting Month [Series IV] |
IMG | - o - | 2591-2595 |
| 1998.11.25 |
S1998K25 | S-S | Stamp Collecting Month [Series IV] |
IMG | - o - | 2596 |
| 1998.12.01 |
A1998L01 | SPE | New Year's Greeting Series VIII |
IMG | - o - | 2539 |
| 1998.12.01 |
S1998L01 | S-S | New Year's Greeting Series VIII |
IMG | - o - | 2541 |
| 1998.12.07 |
S1998L07 | S-S | Pilipinas '98, Series IA |
IMG | - o - | 2541 |
| 1998.12.15 |
A1998L15 | DEF/B-K | Heroes of Revolution |
IMG | - o - | 2609-2618 |
| 1998.12.15 |
K1998L15Y | DEF/B-K | Heroes of Revolution |
IMG | - o - | 2599-2608 |
| 1998.12.15 |
K1998L15G | DEF/B-K | Heroes of Revolution |
IMG | - o - | 2619-2628 |