NOVELTY - Process (I) for the conversion of biomass to an olefin rich product, comprises: (a) converting a biomass feed in a reaction zone (102) to reaction products comprising bio-oil and light gases comprising non-condensables, light paraffins and olefins; (b) separating the reaction products into a liquid bio-oil stream comprising at least a portion of the bio-oil, and a gas stream comprising at least a portion of the olefins; and (c) converting at least a portion of the olefins of the gas stream in a conversion zone (118) to a conversion product stream (126) comprising 5C hydrocarbons.    USE - The process is useful for the conversion of biomass to olefins including ethylene, propylene, butanes and/or pentenes, and 5-14C hydrocarbons, where the biomass feed comprises cellulosic material including lignin, cellulose and/or hemicelluloses (all claimed), and also including forestry wastes e.g. wood chips and saw dust; agricultural waste e.g. straw, corn stover, sugar cane bagasse, municipal waste, yard waste, paper, and card board; energy crops e.g. switch grass, coppice and eucalyptus; and aquatic materials e.g. algae. The bio-oil obtained from the process is used as a fuel or fuel blend e.g. gasoline or a diesel fuel.    ADVANTAGE - The process: is economical as it utilizes biomass materials, which are abundant and are of low cost; and provides high severity (increased temperature and increased catalyst to feed ratio) conversion of biomass, which leads to higher olefin production and oil having a much lower oxygen content.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a process (II) for the conversion of biomass to an olefin rich product comprising: (a) as above per se; (b1) contacting the reaction products with a catalyst, in a conversion zone, for conversion to a conversion product stream by a process including (i) reacting at least a portion of the olefins with each other to form hydrocarbons having a greater number of carbon atoms per molecule than the olefins, (ii) reacting at least a portion of the olefins with at least a portion of the bio-oil thus producing a heavier bio-oil and/or (iii) reacting at least a portion of the olefins with hydrocarbons contained in a hydrocarbon stream separately charged to the conversion zone; (c1) condensing portions of the conversion product stream to form a gas stream comprising the non-condensables and a liquid stream comprising a liquid bio-oil and water; and (d) separating a bio-oil stream comprising the liquid bio-oil from the liquid stream.    DESCRIPTION OF DRAWING(S) - The figure illustrates a flow diagram of process for the conversion of biomass to olefins.    Reaction zone (102)    Separation zone (112)    Conversion zone (118)    Conversion product stream (126)    Hydrotreater (128)