Will this USB wall wort/adaptor work in Cuba? [Photos]

That's the European plug, yes?

It would appear to be dual voltage, which would mean you could plug it into either the 110 or 220 V sockets in Cuba (they do vary). Most 220V sockets could take the European rounded two prong plug like that, as well as the flatter 2 prong US plug (still fits).

However, as a suggestion - you could consider getting a universal adaptor anyway just in case, with surge protection and ideally multi-plug - some come with multiple USB ports and plugs, which would cover you not only for any surprises there, but for travel to many other countries in the future as well.