This is a list of the largest radio galaxies currently discovered arranged by size. This list includes radio galaxies over 10 million light years across, equivalent to approximately 3 megaparsecs.
Radio galaxies with radio lobes (also known as radio emissions) that extend further than 2.3 million light years or 0.7 megaparsecs in length are classified as giant radio galaxies, also referred as GRGs. Giant radio galaxies that contain quasars in their galactic centers are commonly called giant radio quasars, also known as GRQs.
Overview A radio galaxy is a type of galaxy with vast areas of radio emissions stretching far beyond the apparent structure. The powerful radio lobes are generated by the jets from the active galactic nucleus. The very luminous galactic center known as the active galactic nucleus (AGN) is usually powered by a supermassive black hole.
List Below is the list of the largest radio galaxies known, with diameters of over 9.7 million light years or 3 megaparsecs. The radio lobes are usually measured using the total angular diameter and the distance of the host galaxy.
Radio galaxy name Diameter of radio lobes in light-years Diameter of radio lobes in megaparsecs NotesTXS 0033+25226,042,0007.985Largest radio galaxy discovered so far.Porphyrion22,831,0007An article from 2025 suggests a diameter of 6.16 megaparsecs.J0838+532721,461,0006.58ILT J132739.02+350643.020,389,0006.251J0103+2305 19,243,0005.9J0947-133818,917,0005.8ILT J092754.27+351037.118,880,0005.789ILT J083456.98+541742.418,447,0005.656J0901+442017,612,0005.4J1108+291616,960,0005.2SDSS J081956.41+323537.616,539,0005.071An article from 2025 suggests a diameter of 4.66 megaparsecs.Alcyoneus16,275,0004.99An article from 2025 suggests a diameter of 4.74 megaparsecs.J2238+330516,014,0004.91J1420-054515,871,0004.866An article from 2008 suggests a diameter of 4.69 megaparsecs.SDSS J042220.84+151059.815,763,0004.833J0843+020815,753,0004.83ILT J141134.19+630011.615,691,0004.811SDSS J142910.70+311245.015,669,0004.804J0846+374715,656,0004.8J1120+311815,362,0004.71SDSS J131823.42+262622.815,075,0004.622An article from 2025 suggests a diameter of 4.37 megaparsecs.J2035-643415,003,0004.63C 23614,961,0004.587J0157-600014,905,0004.57SDSS J152634.77+262003.214,863,0004.557An article from 2025 suggests a diameter of 4.4 megaparsecs.SDSS J121815.66+382407.514,644,0004.49An article from 2025 suggests a diameter of 4.8 megaparsecs.J0000+121514,547,0004.46J1052+5456C14,514,0004.45J1200+652314,481,0004.44J0226+592714,318,0004.39J1227+143714,286,0004.38NVSS 2146+8214,286,0004.38J1450+672314,220,0004.36J1006+345414,123,0004.33QSO J0931+320414,106,0004.325An article from 2016 suggests a diameter of 4.447 megaparsecs.J0156-071414,025,0004.3SDSS J175735.88+405154.213,986,0004.288An article from 2025 suggests a diameter of 4.48 megaparsecs.J1007+684713,927,0004.27J0320-533013,764,0004.22ILT J173106.33+292302.313,615,0004.175SDSS J161622.52+111135.713,545,0004.153J0228-020713,470,0004.13J1841+400513,438,0004.12J1303+540413,372,0004.1ILT J163813.18+320505.813,356,0004.095SDSS J154709.22+353846.113,291,0004.075J1210+480813,275,0004.07SDSS J013406.32+301537.213,255,0004.064An article from 2025 suggests a diameter of 3.1 megaparsecs.ILT J112515.39+640028.513,108,0004.019SDSS J082747.88+662813.613,105,0004.018An article from 2025 suggests a diameter of 3.74 megaparsecs.J0422+151212,981,0003.98J0839+021312,948,0003.97J2321-194212,753,0003.91J1050+570612,753,0003.91SDSS J012440.54+194003.912,707,0003.896An article from 2025 suggests a diameter of 3.3 megaparsecs.SDSS J155339.76+282813.112,639,0003.8752MASX J18212693+263935012,586,0003.859An article from 2025 suggests a diameter of 3.7 megaparsecs.SDSS J162656.58+543421.312,528,0003.841An article from 2024 suggests a diameter of 3.55 megaparsecs.J1245+460412,524,0003.84QSO J1410+295512,453,0003.818J0153-271312,394,0003.8J1118+643312,394,0003.8J0352-245112,361,0003.79AKSAP J0107-234712,361,0003.79An article from 2025 suggests a diameter of 3.68 megaparsecs.SDSS J220605.67+275100.312,332,0003.781An article from 2025 suggests a diameter of 3.92 megaparsecs.J1438+335512,329,0003.78An article from 2025 suggests a diameter of 3.6 megaparsecs. SDSS J023544.96+310447.512,312,0003.775An article from 2025 suggests a diameter of 3.52 megaparsecs.J1542+373612,296,0003.77NVSS J090535+67040812,290,0003.768J1202+021112,263,0003.76J1101-115112,263,0003.76ILT J153532.25+435152.012,231,0003.75J1320+602212,198,0003.74J0509+042012,198,0003.74J2145+81912,195,0003.739J1314+693712,133,0003.72GRG J200843+00491812,100,0003.71J1637+394912,068,0003.7J1558-213812,068,0003.7ILT J082408.14+381850.912,066,0003.699J1546+683812,003,0003.68ILT J224103.12+273246.511,984,0003.674J1637+320411,937,0003.66J1113+210011,937,0003.66SDSS J180117.72+510722.411,931,0003.658J1637+193611,872,0003.64ILT J134212.48+411138.011,867,0003.638ILT J083017.89+595011.611,846,0003.632SDSS J123900.69+360924.511,797,0003.617An article from 2025 suggests a diameter of 3.43 megaparsecs.SDSS J102430.93+381842.811,797,0003.617An article from 2025 suggests a diameter of 3.37 megaparsecs.J1547+514711,774,0003.61ILT J092223.32+450004.711,763,0003.606SDSS J172051.08+294256.811,624,0003.564SDSS J090534.54+563052.011,592,0003.554An article from 2025 suggests a diameter of 3.05 megaparsecs.SDSS J133105.80+293435.711,582,0003.551An article from 2025 suggests a diameter of 3.33 megaparsecs.ILT J105716.30+535638.111,533,0003.536SDSS J223649.76+251242.511,523,0003.533An article from 2025 suggests a diameter of 3.12 megaparsecs.SDSS J230125.38+240148.211,504,0003.527An article from 2025 suggests a diameter of 3.09 megaparsecs.J0156-652911,415,0003.5J0905+552611,383,0003.49J0047-620611,383,0003.49AKSAP J0059-235211,383,0003.49An article from 2025 suggests a diameter of 3.44 megaparsecs.SDSS J004848.01+021003.111,383,0003.49An article from 2025 suggests a diameter of 3.41 megaparsecs.SDSS J220239.13+070656.711,360,0003.483J1102+134511,350,0003.48An article from 2025 suggests a diameter of 3.07 mpc.GRG J235531+02560711,350,0003.48SDSS J165113.78+320943.411,344,0003.478An article from 2025 suggests a diameter of 3.29 megaparsecs.NVSS J064804+70493911,318,0003.47J1113-380111,318,0003.47SDSS J004459.89+284748.511,298,0003.464An article from 2025 suggests a diameter of 3.3 megaparsecs.J1605+443411,285,0003.46J2223+183111,252,0003.45J0648+704911,220,0003.44GRG J123501.52+531755.0911,220,0003.44J0054-495211,155,0003.42ILT J102928.87+390233.511,136,0003.414J1049+131111,122,0003.41J1423+352911,122,0003.41An article from 2025 suggests a diameter of 3.34 megaparsecs.J0923+074211,089,0003.4J1150+461811,057,0003.39J0742-640711,057,0003.39LEDA 269592411,053,0003.389 J2216-573710,991,0003.37SDSSCGB 17961.2 10,969,000 3.363 ILT J085551.47+541539.710,957,0003.359J1036+373210,926,0003.35SDSS J112912.14+273313.910,881,0003.336 SDSS J163659.07+541725.410,864,000 3.331 An article from 2025 suggests a diameter of 3.1 megaparsecs.SDSS J092826.93+230448.010,855,0003.328 An article from 2025 suggests a diameter of 3.62 megaparsecs.J0044-380410,828,0003.32J2347-664410,828,0003.32J2108-393210,828,0003.32SDSS J001152.65+310024.3 10,825,0003.319An article from 2025 suggests a diameter of 3.02 megaparsecs.J1727+461510,796,0003.31J0939+054010,796,0003.31J1452-023010,763,0003.3J2048-052010,763,0003.3J0911+544010,763,0003.3SDSS J125804.46+273046.010,740,0003.293J1902-560510,731,0003.29NVSS J121012+44033110,704,0003.282J0955-074410,698,0003.28SDSS J084127.02+554627.110,691,0003.278An article from 2025 suggests a diameter of 3.1 megaparsecs.SDSS J143011.92+410404.210,669,0003.271An article from 2025 suggests a diameter of 3.06 megaparsecs.J0319-534010,665,0003.27ILT J084606.48+611634.310,654,0003.267J1452-263810,633,0003.26J1006+483410,600,0003.25J1213-153410,600,0003.25J1234+531810,600,0003.25SDSS J135119.31+340844.110,577,0003.243SDSS J134436.33+291239.610,571,0003.241An article from 2025 suggests a diameter of 3.04 megaparsecs.SDSS J112638.34+302541.910,551,0003.235An article from 2025 suggests a diameter of 3.1 megaparsecs.SDSS J012342.20+293633.110,489,0003.216An article from 2025 suggests a diameter of 3.15 megaparsecs.SDSS J223224.15+285753.310,486,0003.215An article from 2025 suggests a diameter of 3.14 megaparsecs.ILT J143212.04+604558.810,476,0003.212J0907+670610,470,0003.21SDSS J103731.47+312948.910,460,0003.207An article from 2025 suggests a diameter of 3 megaparsecs.SDSS J154742.69+384119.410,453,0003.205SDSS J114333.93+425800.510,440,0003.201SDSS J122329.86+313116.010,437,0003.2J1411+625910,437,0003.2J0105-080810,437,0003.2J1220+383710,437,0003.2J0153+594610,437,0003.2J1008-265210,437,0003.2J1400+301710,430,0003.198ILT J073311.58+393815.510,403,0003.19NVSS J140904+67474810,355,0003.175ILT J085412.34+601825.810,343,0003.171J1104+6007C10,339,0003.17J0041+291210,339,0003.17J0825+69310,313,0003.162J1305-381410,274,0003.15J1311+405910,274,0003.15SDSS J084354.54+494919.010,271,0003.149J1343+375810,241,0003.14J1650+391210,241,0003.14J1616+482510,241,0003.14SDSS J110420.29+600712.710,209,0003.13J0101+505210,209,0003.13J0740-664710,209,0003.13SDSS J151731.75+320836.510,202,0003.128SDSS J112823.80+095710.810,170,0003.118SDSS J163820.93+441444.210,150,0003.112J1812+673110,143,0003.11ILT J105755.80+470446.410,113,0003.101SDSS J115401.37+593454.210,111,0003.1J0230-523010,111,0003.1J1116-423410,111,0003.1SDSS J020249.26+312959.110,104,0003.098SDSS J141650.07+410150.410,085,0003.092An article from 2025 suggests a diameter of 3.05 megaparsecs.SDSS J072238.85+424236.610,078,0003.09An article from 2025 suggests a diameter of 3.19 megaparsecs.J1429+3230C10,078,0003.09FIRST J152157.7+57242910,068,0003.087SDSS J145004.45+571559.510,049,0003.081J0039-192810,046,0003.08J0019-040810,046,0003.08SDSS J111709.38+673324.510,016,0003.071ILT J134853.94+273705.59,995,0003.065J2129-53409,980,0003.06J0030-03129,980,0003.06J1623-69199,980,0003.06J1530+52439,980,0003.06J0331-77139,980,0003.06J0831+67119,915,0003.04ILT J090337.96+344216.69,885,0003.031SDSS J225412.25+254056.19,876,0003.028SDSS J014009.73+224132.19,876,0003.028ILT J152000.07+303127.29,873,0003.027[DRB2020] 1679,869,0003.026J0006+24029,850,0003.02J0648+39179,817,0003.01J1229+58269,785,0003J1301-03339,785,0003J1511+46059,785,0003NGC 62519,785,0003An article from 2020 suggests a diameter of 1.969 megaparsecs.
Listed below are superlative giant radio galaxies under 9.7 million light years or 3 megaparsecs in diameter.
Radio galaxy name Size of radio lobes in light years Size of radio lobes in megaparsecs NotesNGC 61858,297,0002.544Largest spiral-hosted radio galaxy.Z 49-1388,232,0002.524Largest lenticular-hosted radio galaxy.DA 2404,566,0001.4One of the first discovered giant radio galaxies.ILT J141446.18+544658.84,312,0001.322Most massive giant radio galaxy, stellar mass is 1.2 trillion .ILT J160819.77+601708.04,012,0001.23Least massive giant radio galaxy, stellar mass is 33,000 .NGC 23003,496,0001.072Closest giant radio galaxy, redshift is z = 0.00635.ILT J120019.48+361924.12,430,0000.745Most distant giant radio galaxy, redshift is z = 4.369
See also Radio galaxy List of largest galaxies List of spiral DRAGNs
References