- Geranium sanguineum – Bloody Cranesbill, Bloody Geranium
- Geranium santacruzense
- Geranium santanderiense
- Geranium saxatile
- Geranium schiedeanum
- Geranium schimpffii
- Geranium schlechteri
- Geranium schultzei
- Geranium scissum
- Geranium scullyi
- Geranium sebosum
- Geranium seemannii
- Geranium selloi
- Geranium sepalo-roseum
- Geranium sericeum
- Geranium sessiliflorum
- Geranium sessiliflorum ssp. brevicaule
- Geranium sessiliflorum ssp. sessiliflorum
- Geranium shensianum
- Geranium shikokianum
- Geranium siamense
- Geranium sibbaldioides
- Geranium sibiricum – Siberian Geranium
- Geranium sinense
- Geranium skottsbergii
- Geranium smithianum
- Geranium soboliferum
- Geranium sodiroanum
- Geranium solanderi – Solander's Geranium
- Geranium solanderi var. grande
- Geranium solanderi var. solanderi
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- Geranium solitarium
- Geranium sophiae
- Geranium soratae
- Geranium sparsiflorum
- Geranium squamosum
- Geranium staffordianum
- Geranium stapfianum
- Geranium stoloniferum
- Geranium stramineum
- Geranium strictipes
- Geranium stuebelii
- Geranium subacutum
- Geranium subargenteum
- Geranium subcaulescens
- Geranium subcompositum
- Geranium subglabrum
- Geranium sublaevispermum
- Geranium subnudicaule
- Geranium subscandens
- Geranium subsericeum
- Geranium subulato-stipulatum
- Geranium subumbelliforme
- Geranium superbum
- Geranium suzukii
- Geranium swatense
- Geranium sylvaticum – Wood Cranesbill, Woodland Geranium
- Geranium sylvaticum var. wanneri
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