- Geranium aculeolatum
- Geranium aequale
- Geranium aequatoriale
- Geranium affine
- Geranium albanum
- Geranium albicans
- Geranium albidum
- Geranium albiflorum
- Geranium album
- Geranium alonsoi
- Geranium alpicola
- Geranium amatolicum
- Geranium amoenum
- Geranium andicola
- Geranium andringitense
- Geranium angelense
- Geranium angustipetalum
- Geranium antisanae
- Geranium antrorsum
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- Geranium apricum
- Geranium arabicum
- Geranium arachnoideum
- Geranium arboreum – Hawaiʻi Red Cranesbill, Hawaiian Red-flowered Geranium
- Geranium ardjunense
- Geranium argenteum – Silvery Cranesbill
- Geranium argentinum
- Geranium aristatum
- Geranium asiaticum
- Geranium asphodeloides – Turkish Rock Geranium
- Geranium atlanticum
- Geranium atropurpureum – Western Purple Cranesbill
- Geranium austroapenninum
- Geranium ayacuchense
- Geranium ayavacense
- Geranium azorelloides
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