An integrated selective series-flow hydrocracking process for producing diesel and/or naptha product streams, respectively boiling in the range from 180 °C to 370 °C and 36 °C to 180 °C, from a feedstock, including: a. separating the hydrocarbon feed into an aromatic-lean fraction and an aromatic-rich fraction; b. hydroprocessing the aromatic-rich fraction in a first vessel of a first stage hydroprocessing reaction zone operating under conditions effective to hydrotreat and hydrocrack at least a portion of aromatic compounds contained in the aromatic-rich fraction to produce a first vessel first stage hydroprocessing reaction zone effluent; c. hydroprocessing the aromatic-lean fraction in a second vessel of the first stage hydroprocessing reaction zone operating under conditions effective to hydrotreat and hydrocrack at least a portion of paraffin and naphthene compounds contained in the aromatic-lean fraction to produce a second vessel first stage hydroprocessing reaction zone effluent; d. hydroprocessing a mixture of first vessel first stage hydroprocessing reaction zone effluent and second vessel first stage hydroprocessing reaction zone effluent in a second stage hydroprocessing reaction zone to produce a second stage hydroprocessing reaction zone effluent; and e. fractionating the second stage hydroprocessing reaction zone effluent to produce one or more diesel and/or naphtha product streams and one or more bottoms streams, wherein the first vessel of the first stage hydroprocessing reaction zone is operated at a reaction temperature in the range of from 300 °C to 500 °C, a reaction pressure in the range from 130 bar to 200 bar, a hydrogen feed rate below 2,500 standard liters per liter of hydrocarbon feed, and a LHSV in the range of from 0.25 h -1 to 3.0 h -1 to remove heteroatoms from, and to hydrocrack, at least a portion of aromatic compounds contained in the aromatic-rich fraction, and the second vessel of the first stage hydroprocessing reaction zone is operated at a reaction temperature in the range of from 300 °C to 500 °C, a reaction pressure in the range from 30 bar to 100 bar, a hydrogen feed rate below 2,500 standard liters per liter of hydrocarbon feed, and a LHSV in the range of from 1.0 h -1 to 5.0 h -1 to remove heteroatoms from, and to hydrocrack, at least a portion of paraffin and naphthene compounds contained in the aromatic-lean fraction. a. separating the hydrocarbon feed into an aromatic-lean fraction and an aromatic-rich fraction; b. hydroprocessing the aromatic-rich fraction in a first vessel of a first stage hydroprocessing reaction zone operating under conditions effective to hydrotreat and hydrocrack at least a portion of aromatic compounds contained in the aromatic-rich fraction to produce a first vessel first stage hydroprocessing reaction zone effluent; c. hydroprocessing the aromatic-lean fraction in a second vessel of the first stage hydroprocessing reaction zone operating under conditions effective to hydrotreat and hydrocrack at least a portion of paraffin and naphthene compounds contained in the aromatic-lean fraction to produce a second vessel first stage hydroprocessing reaction zone effluent; d. hydroprocessing a mixture of first vessel first stage hydroprocessing reaction zone effluent and second vessel first stage hydroprocessing reaction zone effluent in a second stage hydroprocessing reaction zone to produce a second stage hydroprocessing reaction zone effluent; and e. fractionating the second stage hydroprocessing reaction zone effluent to produce one or more diesel and/or naphtha product streams and one or more bottoms streams,