�@We discuss extension of soliton theories 
and integrable systems to noncommutative spaces. 
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We first review noncommutative instantons, where resolution 
of singularities yields new physical objects. 
Next, we will show that various noncommutative soliton 
equations such as KP and KdV equations possess 
infinite conserved quantities and exact soliton solutions. 
This suggests that integrability would be still preserved 
on noncommutative spaces and an infinite dimensional 
symmetry would be hidden.