Abstract: An improved portable Safety Barrier may be used to prevent accidental entry into dangerous areas. According to a preferred embodiment the barrier comprises a bar means and a pair of attaching means, typically clamps, connected at the two ends of the bar means. A C-type clamp may be employed to connect the bar means to a U-shaped support or a two plate clamp means may be used to attach the bar to the point where two U-shaped struts converge in a T. The attaching means can also comprise a shackle type clamp for attachment to rounded objects or it may be a pointed tip suitable for attachment to a surface having receiving holes therein.The bar means may comprise a telescoping assembly in which one member is slideably received in the other so that the length of the assembly is adjustable to match various width passageways. Alternatively, two pipes or bars of different diameters may be attached together by a suitable diameter reducing means.