| John Caswell | 6ER6XE0PCR | topic | open | Wikipedia John Caswell, Wikidata Q6225513 |
| John Caulfield Hannyngton | 4J9G8GTZXN | topic | open | Wikipedia John Caulfield Hannyngton, Wikidata Q106812020 |
| John Chambers | EYHRB9J9V7 | topic | open | Wikipedia John Chambers (statistician), Wikidata Q3181218 |
| John Charles Burkill | C3D86TSXJ8 | topic | open | Wikipedia John Charles Burkill, Wikidata Q1699594 |
| John Charles Fields | 7A1Q8YW1VG | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q315431, ProofWiki Mathematician:John_Charles_Fields, Wikipedia John Charles Fields |
| John Charles Fields | ZVK3WADXMS | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#63XL, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#L5CJ, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#NKQI |
| John Clive Ward | 9KMWFK7KTF | unknown | open | Wikipedia List of people by Erdős number#DJCF |
| John Coleman Moore | 26GTZZ08ES | topic | open | Wikipedia List of people by Erdős number#L8G3, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#GDNH, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#XEA3 |
| John Coleman Moore | K7M2DRBYKT | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q1676282, nLab John Moore, Wikipedia John Coleman Moore |
| John Collins | CYYW3JY80M | topic | open | Wikipedia John Collins (mathematician), Wikidata Q1279339 |
| John Colson | VJJBHE4NPC | topic | open | Wikipedia John Colson, Wikidata Q1394680 |
| John Constance Parnis | GQSQFG4PGH | topic | open | Wikipedia John Constance Parnis, Wikidata Q6226960 |
| John Corcoran | 8T7VWPZ3FY | topic | open | Wikipedia John Corcoran (logician), Wikidata Q1699663 |
| John Corcoran | DVNZ3R3BXQ | topic | open | Wikipedia List of logicians#QAU5 |
| John Couch Adams | R5BG5EJHS3 | topic | open | Wikipedia John Couch Adams, Wikidata Q20015 |
| John Croucher | CE1DAHCWP5 | topic | open | Wikipedia John Croucher, Wikidata Q30348972 |
| John Cruickshank | WWBVC143R5 | topic | open | Wikipedia John Cruickshank (mathematician), Wikidata Q69836049 |
| John D'Angelo | 9JYT5KR9AT | topic | open | Wikipedia John D'Angelo, Wikidata Q102087617 |
| John D. Barrow | 14A0YV7DDS | unknown | open | Wikipedia List of people by Erdős number#MYLT |
| John D. Nesbitt | DJWV6NJZPE | unknown | open | Wikipedia List of University of California, Los Angeles people#U7LR |
| John D. P. Meldrum | 7TZ5A6TMAX | topic | open | Wikipedia John D. P. Meldrum, Wikidata Q102219569 |
| John Dalgleish Donaldson | PP9ASHHDTR | unknown | open | Wikipedia List of people by Erdős number#12KZ |
| John Daniel Runkle | KHKB61A1VX | topic | open | Wikipedia John Daniel Runkle, Wikidata Q3461596 |
| John Darwin | NDVTD3VXG5 | topic | open | Wikipedia John Darwin (statistician), Wikidata Q6228602 |
| John David Crawford | SQV5GQNRPJ | topic | open | Wikipedia John David Crawford, Wikidata Q20656840 |
| John David Maitland Wright | EDENKWBWVT | topic | open | Wikipedia John David Maitland Wright, Wikidata Q123117000 |
| John Dee | 1BTE8DR8B4 | unknown | open | Wikipedia List of cryptographers#73F1 |
| John Dirk Walecka | VEP17AR34S | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q1699823, nLab John Dirk Walecka |
| John domain | GP64FK3GCT | definition | record (an item of a paper that no node asks for yet. The record keeps its edges in the record plane (corpus arxiv AX8.6)) | arXiv 2609.24041#OJAS |
| John Dossey | KE8PYPTSJZ | topic | open | Wikipedia John Dossey, Wikidata Q102162792 |
| John Dougall | 5DR8TPTH1X | topic | open | Wikipedia John Dougall (mathematician), Wikidata Q14949068 |
| John Dougall | WPXPSKK00K | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#ZQ8Y |
| John Dumbleton | W8D1DVHH7D | unknown | open | Wikipedia List of logicians#DJ4H |
| John Duns Scotus | CQQAKSHHG3 | topic | open | Wikipedia List of logicians#590Z |
| John E. Dennis | G0YT2YB444 | topic | open | Wikipedia John E. Dennis, Wikidata Q6230710 |
| John E. Freund | J7XJ3Q6NTM | topic | open | Wikipedia List of fellows of the American Statistical Association#QLLV |
| John E. Freund | R1XKY9ZB80 | topic | open | Wikipedia John E. Freund, Wikidata Q19878322 |
| John E. Osborn | NRYEHMDCP8 | topic | open | Wikipedia John E. Osborn (mathematician), Wikidata Q6230867 |
| John E. Savage | 2PJDKZYH6M | unknown | open | Wikipedia List of people by Erdős number#05H4 |
| John Eccles | VVNFQTQPH3 | unknown | open | Wikipedia List of people by Erdős number#44QX |
| John Edensor Littlewood | 1546JDJP0Y | topic | open | Wikipedia John Edensor Littlewood, Wikidata Q353426 |
| John Edensor Littlewood | Z3DGZNZMXJ | topic | open | Wikipedia List of people by Erdős number#NLDT, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#B6IE, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#OXTM |
| John Edmund Kerrich | H8TFVFG7NR | topic | open | Wikipedia John Edmund Kerrich, Wikidata Q6231228 |
| John Edward Anderson | BWTZKESNA9 | unknown | open | Wikipedia List of University of California, Los Angeles people#5A8L |
| John Edward Campbell | XCM28T1CYS | topic | open | Wikipedia John Edward Campbell, Wikidata Q6231282 |
| John Edwin Luecke | 9XMEJZ578N | topic | open | Wikipedia List of people by Erdős number#G7G7, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#4Q3X |
| John Edwin Luecke | ZY8SNG8Q4G | topic | open | Wikipedia John Edwin Luecke, Wikidata Q6231442 |
| John Ehrlichman | T8FPJWCWKK | unknown | open | Wikipedia List of University of California, Los Angeles people#8OWS |
| John ellipsoid | NT8DN3TRY6 | definition | open | Wikipedia List of convexity topics#3YV1 |
| John ellipsoid | VH7CDK2R0N | definition | open | Wikipedia List of theorems#RSD4 |
| John ellipsoid | Z7JHCDJ7P6 | statement | open | mathlib_1000 Q1699024, Wikidata Q1699024, thousand_plus Q1699024, Wikipedia John ellipsoid |
| John Ellis | GRW6PBK4SJ | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q116386, nLab John Ellis |
| John Erik Fornaess | 9VZQ8VV9TX | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#PXMU |
| John Erik Fornæss | X644KSS86C | topic | open | Wikipedia John Erik Fornæss, Wikidata Q1699977 |
| John Etchemendy | 5Q88A5X760 | topic | open | Wikipedia John Etchemendy, Wikidata Q6231954 |
| John Etchemendy | 6CW268WP0A | topic | open | Wikipedia List of logicians#SRNV |
| John Etnyre | BBTJKENK13 | topic | open | Wikipedia John Etnyre, Wikidata Q102182879 |
| John F. Hughes | N9XVD3EJ35 | unknown | open | Wikipedia List of people by Erdős number#E2T4 |
| John F. MacGregor | 5440DAAA8R | topic | open | Wikipedia List of fellows of the American Statistical Association#NE6A |
| John F. MacGregor | N4RY1DC8P6 | topic | open | Wikipedia John F. MacGregor, Wikidata Q6232436 |
| John Fahey | GJK7ZQKRVK | unknown | open | Wikipedia List of University of California, Los Angeles people#0WXP |
| John Fauvel | HTT9CNMM7D | topic | open | Wikipedia John Fauvel, Wikidata Q1426930 |
| John Finlaison | J6CN8Q0DQ5 | unknown | open | Wikipedia List of actuaries#KZ8Y |
| John Flavel | SP8TGR0563 | topic | open | Wikipedia John Flavel (logician), Wikidata Q6233399 |
| John Flinders Petrie | ZCP6NCYCKV | topic | open | Wikipedia John Flinders Petrie, Wikidata Q5933241 |
| John Forbes Nash Jr. | 6CRBVJ8ZWV | topic | open | Wikipedia John Forbes Nash Jr., Wikidata Q128736 |
| John Forbes Nash Jr. | Z4ZQTQN49T | topic | open | Wikipedia List of people by Erdős number#845E |
| John Frank Adams | GNB0VBGYS0 | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#7FRB, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#GVRK |
| John Franks | 2GC4BSTJQB | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#9223 |
| John Friedlander | EC29TP61AZ | topic | open | Wikipedia John Friedlander, Wikidata Q470462 |
| John Friedlander | R9WBB4SAYE | topic | open | Wikipedia List of people by Erdős number#5Z1F |
| John G. Thompson | D3BWFX4B3X | topic | open | Wikipedia John G. Thompson, Wikidata Q313168 |
| John G. Thompson | NXG9FGR89N | topic | open | Wikipedia List of people by Erdős number#8TEI |
| John Gill | CD6K0AR1D6 | topic | open | Wikipedia John Gill (climber), Wikidata Q325036 |
| John Gordon Skellam | CWGNCEJ5EA | topic | open | Wikipedia John Gordon Skellam, Wikidata Q662692 |
| John Graunt | B253S6WTXM | topic | open | Wikipedia List of actuaries#KLI0 |
| John Graunt | CNG4BAE7H8 | topic | open | Wikipedia John Graunt, Wikidata Q454938 |
| John Gray | WXCKAK7FKM | topic | open | Wikipedia John Gray (mathematician), Wikidata Q21165836 |
| John Greaves | 1X0JWE9VD1 | topic | open | Wikipedia John Greaves, Wikidata Q381336 |
| John Greenlees Semple | SJV6RWFRFX | topic | open | Wikipedia John Greenlees Semple, Wikidata Q11108584 |
| John Greig | N4K3HRX50C | topic | open | Wikipedia John Greig (mathematician), Wikidata Q6236277 |
| John Griffiths | CVCT4QQKB4 | topic | open | Wikipedia John Griffiths (mathematician), Wikidata Q6236409 |
| John Griggs Thompson | H30YB7GACW | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#9SH4, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#MRZU, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#NY1V |
| John Grue | 2JPKX9A9BK | topic | open | Wikipedia John Grue, Wikidata Q6236511 |
| John Guckenheimer | MGRH2ENKXT | unknown | open | Wikipedia List of people by Erdős number#C1SX |
| John H. Coates | 6HW5VJSQ66 | topic | open | Wikipedia John H. Coates, Wikidata Q671993 |
| John H. Coates | JB6GVX77TP | topic | open | Wikipedia List of people by Erdős number#J91P, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#7CCC |
| John H. Gray | 2N55RPX7XM | unknown | open | Wikipedia List of fellows of the American Statistical Association#S2BM |
| John H. Hubbard | 419HNXJ0J2 | topic | open | Wikipedia John H. Hubbard, Wikidata Q464212 |
| John H. Reif | WNE7KNN2PS | unknown | open | Wikipedia List of people by Erdős number#Q4WF |
| John H. Schuenemeyer | BJ3KMW4XT0 | unknown | open | Wikipedia List of fellows of the American Statistical Association#ARH2 |
| John H. Schwarz | V5D7AK43R0 | unknown | open | Wikipedia List of string theory topics#NFP9 |
| John H. Smith | JKJRVD6F1A | topic | open | Wikipedia John H. Smith (mathematician), Wikidata Q6237087 |
| John H. Smith | W569QWB0TQ | topic | open | Wikipedia List of fellows of the American Statistical Association#MI4S |
| John H. Thompson | D2FB5Q3DBH | topic | open | Wikipedia List of fellows of the American Statistical Association#ZOCN |
| John H. Thompson | V51358B7XN | topic | open | Wikipedia John H. Thompson (statistician), Wikidata Q18739313 |
| John H. Walter | SRB0XCNWSY | topic | open | Wikipedia John H. Walter, Wikidata Q15966642 |
| John H. Wolfe | Q6RTWSF725 | topic | open | Wikipedia John H. Wolfe, Wikidata Q101076071 |
| John Hajnal | 10PFVXS60N | topic | open | Wikipedia John Hajnal, Wikidata Q1979030 |
| John Hajnal | 9F1S5ZS68J | topic | open | Wikipedia List of Jewish mathematicians#N01B |