Valentino Siani (c.1595–1672) was an Italian violinmaker who worked in Brescia and Florence.
He was a pupil of Giovanni Paolo Maggini in Brescia (c.1610–1620) before he moved to Florence in c.1620 where he worked c.1620–1670.
Sianis' instruments have a rather full arching, narrow purfling in very nicely channelled edges, and stiff f-holes.
A viola by Valentino Siani is pictured in Italian Violinmakers by Walter Hamma.
This Italian biographical article related to music is a stub.