Below is a list of the promotional giveaways for the 1998 Arizona Diamondbacks Season.
| April | ||
| Date | Description | Quantity |
| March 31 |
Building Partners Seat Cushions |
50,000 |
| March 31 | 76/Circle K Ticket Holders |
50,000 |
| March 31 | Las Vegas Trading Discs #1 |
15,000 |
| April 1 |
Pepsi-Cola Schedule Magnets |
15,000 |
| April 2 | Bank One Collector's Pin #1 |
15,000 |
| April 3 | Miller Lite Schedule Posters (for fans 21 years and older) |
10,000 |
| April 4 | McDonalds Mini Helmets (for kids 15 years and younger) |
10,000 |
| April 5 | News Radio KTAR 620 Schedule Key Chains |
10,000 |
| April 18 | Tobacco Education Prevention Program Baseball Gloves (for kids 15 years and younger) |
10,000 |
| April 20 | 76/Circle K Snakeskin Baseballs | 10,000 |
| April 28 | KPHO Water Bottles | 10,000 |
| May | ||
| Date | Description | Quantity |
| May 11 | US West D-Backs Calling Cards |
10,000 |
| May 12 | America West Airlines Soft Collector's Planes | 10,000 |
| May 13 | Miller Light Scratch-n-Sniff Game Pieces (for fans 21 years and older) |
40,000 |
| May 14 | Las Vegas Trading Discs #2 |
10,000 |
| May 16 | Pepsi-Cola Equipment Bags |
10,000 |
| May 18 | Nissan T-Shirts |
10,000 |
| May 24 | Major League Baseball Kid's Magazine #1 (for kids 15 years and younger) |
15,000 |
| May 25 | Gila River Casino Binoculars (for fans 21 years and older) |
10,000 |
| May 27 | Cox Communications Baseball Caps |
10,000 |
| June | ||
| Date | Description | Quantity |
| June 9 | Bank One Collector's Pins #2 |
15,000 |
| June 11 | 76/Circle K Fountain Mugs |
10,000 |
| June 12 | AutoZone Batting Gloves (for kids 15 years and younger) |
5,000 |
| June 14 | 3TV "Hissy" Beanie Babies (for kids 15 years and younger) |
6,500 |
| June 24 | Shamrock Farms Night |
|
| June 25 | Circle K Snakeskin Treat Bags | 10,000 |
| July | ||
| Date | Description | Quantity |
| July 14 | The Arizona Republic Line-Up Posters #1 |
10,000 |
| July 17 | Miller Light Night (for fans 21 years and older) |
|
| July 18 | Bank One Collector's Pins #3 |
15,000 |
| July 19 | US West Rattles |
10,000 |
| July 28 | 3TV Beach Towels |
7,000 |
| July 29 | McDonald's Yo-Yo's (for kids 15 years and younger) |
10,000 |
| August | ||
| Date | Description | Quantity |
| August 10 | Discount Tires Fanny Packs |
10,000 |
| August 12 | News Radio KTAR 620 Player Magnets |
10,000 |
| August 14 | McDonald's Baseball Card Sets (for kids 15 years and younger) |
10,000 |
| August 15 | America West Airlines Mousepads |
10,000 |
| August 19 | Shamrock Farms Growth Charts (for kids 15 years and younger) |
10,000 |
| August 29 | AutoZone Batting Gloves (for kids 15 years and younger) |
5,000 |
| August 30 | Fuji Film Fan Photo Day |
|
| September | ||
| Date | Description | Quantity |
| September 4 | Gila River Casino Sports Towels (for fans 21 years and older) |
10,000 |
| September 6 | Major League Baseball Kid's Magazine #2 (for kids 15 years and younger) |
15,000 |
| September 7 | The Arizona Republic Line-Up Posters #2 |
10,000 |
| September 9 | Las Vegas Trading Discs #3 | 10,000 |
| September 15 | Infinity Replica Jerseys |
10,000 |
| September 16 | Bank One Collector's Pins #4 | 15,000 |
| September 17 | Miller Lite Night |
|
| September 18 | 76 Antenna Balls |
10,000 |
| September 19 | 3TV Sports Bags (for fans 21 years and older) |
10,000 |
| September 20 | Gila River Casino Visor Night (for fans 21 years and older) |
10,000 |
| September 26 | Tobacco Education Prevention Program Baseball Bats (for kids 15 years and younger) |
10,000 |
| September 27 | Fan Appreciation Day | |
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