Abstract: A variable angle joist support includes a base plate mounted to a first surface of a supporting beam and a pair of spaced apart support sides flexibly attached to the base plate. The support sides sandwich a joist to be supported at a variable interface angle relative to said beam. Each support side includes a support section which is positionable to fit flush against respective side surface of the joist. The flexible attachment of the support sides to the base plate allows the support sides to pivot about a beam mounted base plate in order to receive a joist at any desired interface angle. The support sides can be flexibly attached to the base plate using hinges or malleable accordion shaped sections. The support sides can be provided with coplanar bottom flanges for support of and interconnection to a bottom surface of the joist. The support sides may be made of a malleable material or include multiple hinged support sections.