A process for production of High-Octane Gasoline blending component, Heavy Naphtha with high aromatic content and High Cetane Diesel from high aromatic middle distillate range boiling streams, the process comprising the steps of: (a) subjecting a combined feed-1 and feed-2 to a hydrotreating step at a predetermined pressure to obtain a first effluent having removed heteroatom, wherein the pressure is capable of saturating of only one ring of multi-ring aromatics, wherein the hydrotreating step is carried out at a pressure of 25 to 100 bar g, and at a temperature of 320 to 410°C, and at a LHSV of 0.5 to 1.5 h -1; (b) subjecting the first effluent to a hydrocracking step to obtain a second effluent, wherein the hydrocracking is operated for selective opening of saturated ring of the multi-ring aromatics and hydrocracking of long aliphatic side chains of mono-aromatic molecule present in the first effluent, wherein the hydrocracking step is carried out at a pressure of 25 to 100 bar g, at a temperature of 350 to 450°C, and at a LHSV of 0.2 to 2.0 h -1; (c) fractionating the second effluent into a CUT-1, a CUT-2 and a CUT-3; wherein: the CUT-1 is having boiling point between 3 5 and 95°C, which is High-Octane gasoline blending component having octane number greater than 88; the Cut-2 is having a boiling point between 95 and 210°C, which is Heavy Naphtha with high aromatic content; and the Cut-3 is having boiling point above 210°C which is High Cetane Diesel having cetane number more than 50 and comprising an enhanced concentration of saturates, wherein the process further comprising recycling a part of the high cetane diesel of step (c) to step (a); wherein the feed-1 is middle distillate boiling range stream obtained from catalytic cracking unit, and feed-2 is middle distillate boiling range stream obtained from thermal cracking unit and the feed-2 is present in the combined feed in the range of 5 to 30 wt%; wherein the combined feed for the process is having at least 30 wt% two or more ring aromatics content therein and boiling between 140 to 430°C; wherein the feed-1 is light cycle oil and the feed-2 is coker gas oil. (a) subjecting a combined feed-1 and feed-2 to a hydrotreating step at a predetermined pressure to obtain a first effluent having removed heteroatom, wherein the pressure is capable of saturating of only one ring of multi-ring aromatics, wherein the hydrotreating step is carried out at a pressure of 25 to 100 bar g, and at a temperature of 320 to 410°C, and at a LHSV of 0.5 to 1.5 h -1; (b) subjecting the first effluent to a hydrocracking step to obtain a second effluent, wherein the hydrocracking is operated for selective opening of saturated ring of the multi-ring aromatics and hydrocracking of long aliphatic side chains of mono-aromatic molecule present in the first effluent, wherein the hydrocracking step is carried out at a pressure of 25 to 100 bar g, at a temperature of 350 to 450°C, and at a LHSV of 0.2 to 2.0 h -1; (c) fractionating the second effluent into a CUT-1, a CUT-2 and a CUT-3; wherein: the CUT-1 is having boiling point between 3 5 and 95°C, which is High-Octane gasoline blending component having octane number greater than 88; the Cut-2 is having a boiling point between 95 and 210°C, which is Heavy Naphtha with high aromatic content; and the Cut-3 is having boiling point above 210°C which is High Cetane Diesel having cetane number more than 50 and comprising an enhanced concentration of saturates, wherein the process further comprising recycling a part of the high cetane diesel of step (c) to step (a); wherein the feed-1 is middle distillate boiling range stream obtained from catalytic cracking unit, and feed-2 is middle distillate boiling range stream obtained from thermal cracking unit and the feed-2 is present in the combined feed in the range of 5 to 30 wt%; wherein the combined feed for the process is having at least 30 wt% two or more ring aromatics content therein and boiling between 140 to 430°C; wherein the feed-1 is light cycle oil and the feed-2 is coker gas oil. the CUT-1 is having boiling point between 3 5 and 95°C, which is High-Octane gasoline blending component having octane number greater than 88; the Cut-2 is having a boiling point between 95 and 210°C, which is Heavy Naphtha with high aromatic content; and the Cut-3 is having boiling point above 210°C which is High Cetane Diesel having cetane number more than 50 and comprising an enhanced concentration of saturates, wherein the process further comprising recycling a part of the high cetane diesel of step (c) to step (a); wherein the feed-1 is middle distillate boiling range stream obtained from catalytic cracking unit, and feed-2 is middle distillate boiling range stream obtained from thermal cracking unit and the feed-2 is present in the combined feed in the range of 5 to 30 wt%; wherein the combined feed for the process is having at least 30 wt% two or more ring aromatics content therein and boiling between 140 to 430°C; wherein the feed-1 is light cycle oil and the feed-2 is coker gas oil. wherein the process further comprising recycling a part of the high cetane diesel of step (c) to step (a); wherein the feed-1 is middle distillate boiling range stream obtained from catalytic cracking unit, and feed-2 is middle distillate boiling range stream obtained from thermal cracking unit and the feed-2 is present in the combined feed in the range of 5 to 30 wt%; wherein the combined feed for the process is having at least 30 wt% two or more ring aromatics content therein and boiling between 140 to 430°C; wherein the feed-1 is light cycle oil and the feed-2 is coker gas oil.