Boron hydrides are hydrogen storage materials which are the object of intensive investigation because they pose tangible solution to the hydrogen storage issue. Today many boron hydrides are intensively investigated: lithium borohydride LiBH4, sodium borohydride NaBH4, potassium borohydride KBH4, new borohydrides like e.g. Ca(BH4)2, Zn(BH4)2 or Zr(BH4)4, combination of hydrides like e.g. LiBH4 and LiNH2 or LiBH4 and MgH2, ammoniaborane NH3BH3, alkali amidoboranes like e.g. LiNH2BH3 or NaNH2BH3, and so on. This book reviews research on boron hydrides and gives a general view of the perspectives of application.