| Name | Kanji | Type | Photo | Year Registered |
| ‘Aaron Cook’ | Stewart | Yes | ||
| ‘Achievement’ | ||||
| ‘Acrobat’ | Glenn Dale | Yes | 1948 | |
| ‘Addy Wery’ | obtusum | Yes | 1940 | |
| ‘Ademurasaki’ | 艶紫 | Hirado | ||
| ‘Ademurasaki’ | 艶紫 | Kurume | Yes | |
| ‘Adesugata’ | 艶姿 | satsuki | ||
| ‘Admiration’ | Azalea indica | Yes | 1849 | |
| ‘Adonis’ | obtusum | Yes | 1952 | |
| ‘Adventglöckchen’ | Belgian indica | Yes | 1929 | |
| ‘Ae14’ | Nijland | Yes | ||
| ‘Ae22’ | Nijland | Yes | ||
| ‘Afternoon Delight’ | Holly Springs | 1997 | ||
| ‘Ageeth’ | obtusum | 1973 | ||
| ‘Agemaki’ | 総角 | Kurume | Yes | |
| ‘Ai-no-Hikari’ | 愛の光 | satsuki | ||
| ‘Ai-no-Kagayaki’ | 愛の輝 | satsuki | 1980 | |
| ‘Ai-no-Nishiki’ | 愛の錦 | satsuki | Yes | 2007 |
| ‘Ai-no-Tsuki’ | 愛の月 | satsuki | Yes | 1969 |
| ‘Aika’ | 愛花 | satsuki | Yes | 2009 |
| ‘Aiko’ | 愛子 | satsuki | 2002 | |
| ‘Aikoku’ | 愛国 | satsuki | Yes | |
| ‘Aioi’ | 相生 | Kurume | Yes | |
| ‘Aisai’ | 愛妻 | satsuki | 2024 | |
| ‘Aishifu’ | satsuki | Yes | ||
| ‘Aizen-no-Tsuki’ | 愛染の月 | satsuki | 1988 | |
| ‘Akakozan’ | 赤晃山 | satsuki | ||
| ‘Akane’ | 茜 | satsuki | ||
| ‘Akari’ | あかり | satsuki | Yes | 2011 |
| ‘Akatsuki-no-Zao’ | 暁の蔵王 | satsuki | Yes | |
| ‘Akebono’ | アケボノ | Hirado | Yes | |
| ‘Akemi-no-Tsuki’ | 明美の月 | satsuki | Yes | 1998 |
| ‘Akihime’ | 亜輝姫 | satsuki | Yes | 2012 |
| ‘Akoyahime’ | 阿古耶姫 | satsuki | Yes | |
| ‘Al Reid’ | Stewart | Yes | ||
| ‘Aladdin’ | Glenn Dale | 1947 | ||
| ‘Aladdin’ | obtusum | Yes | 1943 | |
| ‘Albert-Elisabeth’ | Belgian indica | Yes | 1921 | |
| ‘Aleida’ | obtusum | |||
| ‘Alexander’ | North Tisbury | Yes | 1962 | |
| ‘Alexandre II’ | Belgian indica | Yes | 1857 | |
| ‘Alice’ | Belgian indica | Yes | 1870 | |
| ‘Alice’ | obtusum | Yes | 1922 | |
| ‘Alight’ | Glenn Dale | |||
| ‘Allison Ann’ | Stewart | Yes | ||
| ‘Amagasa’ | 天笠 | satsuki | Yes | 1960 |
| ‘Amagi’ | 天城 | satsuki | 2007 | |
| ‘Ambrosianum’ | Belgian indica | Yes | 1948 | |
| ‘Ambrosii’ | Belgian indica | 1840 |