| John Nunn | ZNY6WJVQN5 | topic | open | Wikipedia John Nunn, Wikidata Q450419 |
| John O'Connor | 2WP1XGGBW2 | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q14525478, ProofWiki Mathematician:John_J._O'Connor |
| John of Palermo | K1H5SAHXP6 | definition | open | Wikipedia John of Palermo, Wikidata Q15972193 |
| John of Salisbury | J77VR8B1FX | topic | open | Wikipedia John of Salisbury, Wikidata Q264028 |
| John of St. Thomas | B9627C95Y5 | unknown | open | Wikipedia List of logicians#SFEM |
| John of Tynemouth | Q3D76HYYHJ | topic | open | Wikipedia John of Tynemouth (geometer), Wikidata Q6265851 |
| John Oprea | RGXKT2GZZV | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q95219780, nLab John Oprea |
| John P. Burgess | 672DSZ2DXY | topic | open | Wikipedia John P. Burgess, Wikidata Q6251515 |
| John P. Hayes | MC7AZYZ7DP | unknown | open | Wikipedia List of people by Erdős number#D1YR |
| John P. Vinti | JDX9E7V1N4 | topic | open | Wikipedia John P. Vinti, Wikidata Q113334884 |
| John Pagus | 9W9D96N99N | topic | open | Wikipedia List of logicians#J8SZ |
| John Pagus | NSRPV6DA3E | topic | open | Wikipedia John Pagus, Wikidata Q6251778 |
| John Pardon | N300G1PD6A | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#M7HC |
| John Pardon | TDNBFRXGRP | topic | open | Wikipedia John Pardon, Wikidata Q21558134 |
| John Patterson | 6JHAFC9G09 | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#6QXD |
| John Pelesko | MD7YD54N2Y | topic | open | Wikipedia John Pelesko, Wikidata Q6252441 |
| John Pell | 7BB5HW905H | topic | open | Wikipedia John Pell (mathematician), Wikidata Q471794 |
| John Penn Mayberry | 2GQS17QGFY | topic | open | Wikipedia John Penn Mayberry, Wikidata Q27460021 |
| John Perry | BDMPWF1PY1 | topic | open | Wikipedia John Perry (engineer), Wikidata Q3182287 |
| John Perry | EVNSY2RSYZ | topic | open | Wikipedia List of University of California, Los Angeles people#LDHP |
| John Perry | J0PEK0YSE7 | topic | open | Wikipedia John Perry (philosopher), Wikidata Q1701398 |
| John Perry (philosopher) | 9FZHAHFZ7Z | topic | open | Wikipedia List of people by Erdős number#MBEO |
| John Philoponus | 4KJSK7ZWE2 | unknown | open | Wikipedia List of Greek mathematicians#XTBO |
| John Platt | G1JNX5F0EA | unknown | open | Wikipedia List of people by Erdős number#63TN |
| John Playfair | NG4D4XNP7W | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q389666, ProofWiki Mathematician:John_Playfair |
| John Playfair | T13NZVD15G | unknown | open | Wikipedia List of geometers#8GCW |
| John Polkinghorne | 24QBQ77Z8B | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q726724, nLab John Polkinghorne, nLab John%20Polkinghorne |
| John Pollard | BZZX8C6QRZ | topic | open | Wikipedia John Pollard (mathematician), Wikidata Q122150 |
| John Preskill | AH2KR98ZHR | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q722128, nLab John Preskill |
| John Pullinger | BY32FX13RK | unknown | open | Wikipedia List of presidents of the Royal Statistical Society#RW8Q |
| John Punch | 5B8X4VP632 | topic | open | Wikipedia John Punch (theologian), Wikidata Q1698179 |
| John Purser | ARA82G8EEA | topic | open | Wikipedia John Purser (mathematician), Wikidata Q22808501 |
| John R. F. Jeffreys | XJ5XFC9WVX | topic | open | Wikipedia John R. F. Jeffreys, Wikidata Q836648 |
| John R. Isbell | 83YXYDYVCS | topic | open | Wikipedia John R. Isbell, Wikidata Q6253889 |
| John R. Klauder | E7BD85GJTX | unknown | open | Wikipedia List of people by Erdős number#LJLB |
| John R. Stallings | 832DPEZEFP | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q1701799, nLab John Stallings, Wikipedia John R. Stallings |
| John R. Stallings | BN43G9JC0F | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#9FEC |
| John R. Steel | 9JZAFNE2Y5 | topic | open | Wikipedia List of logicians#CFIC |
| John R. Steel | P1DXRNTAS3 | topic | open | Wikipedia List of people by Erdős number#HQXW, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#V3BI |
| John R. Steel | SHXZ4Q6W1S | topic | open | Wikipedia John R. Steel, Wikidata Q1701501 |
| John R. Womersley | 8VYVPN21Q7 | topic | open | Wikipedia John R. Womersley, Wikidata Q6254052 |
| John Radford Young | ZM8G7T0WYC | topic | open | Wikipedia John Radford Young, Wikidata Q4534508 |
| John Rainwater | 336JNF0WG2 | topic | open | Wikipedia John Rainwater, Wikidata Q6254122 |
| John Renshaw Carson | N9D7D6ACQW | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#4UTK |
| John Rhodes | YNY66DDYS7 | topic | open | Wikipedia John Rhodes (mathematician), Wikidata Q6254696 |
| John Rigby | DTBRVPQAPB | unknown | open | Wikipedia List of people by Erdős number#757A |
| John Rinzel | HMHRRM1023 | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#YXJ3 |
| John Riordan | 6PZY90HGPF | topic | open | Wikipedia John Riordan (mathematician), Wikidata Q6254971 |
| John Riordan | G6N0F77NXB | topic | open | Wikipedia List of people by Erdős number#PILW |
| John Robert Kline | A21C9X6AB1 | topic | open | Wikipedia John Robert Kline, Wikidata Q10307889 |
| John Robert Ringrose | M8HCA8G0JY | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#1C7N |
| John Robert Stallings, Jr. | N4QACYAQDX | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#4YQ8 |
| John Robertson | N084G819WM | topic | open | Wikipedia John Robertson (mathematician), Wikidata Q18783793 |
| John Roe | 2BWFZXGR0M | topic | open | Wikipedia John Roe (mathematician), Wikidata Q14623404 |
| John Rogers Musselman | 3QEWSWS6VC | unknown | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#70FZ |
| John Rognes | P94VQF68DV | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#HCBW |
| John Rognes | Z6ZDW8RX2W | topic | open | Wikipedia John Rognes (mathematician), Wikidata Q21469528 |
| John Rowning | Q7RNT68GSP | topic | open | Wikipedia John Rowning, Wikidata Q18762011 |
| John Sall | WDKFK43GSG | unknown | open | Wikipedia List of fellows of the American Statistical Association#BIXN |
| John Sanderson | 8JF9MS2HF2 | topic | open | Wikipedia John Sanderson (priest), Wikidata Q15990265 |
| John Sarli | YET82KY1Z4 | topic | open | Wikipedia John Sarli, Wikidata Q102131195 |
| John Scotus Eriugena | 1SEEH9PFBX | topic | open | Wikipedia John Scotus Eriugena, Wikidata Q184500 |
| John Selfridge | 8SZ3C243TV | topic | open | Wikipedia John Selfridge, Wikidata Q454480 |
| John Selfridge | KE1F5617F3 | topic | open | Wikipedia List of people by Erdős number#1QD1 |
| John Seton | QKCGF6GE9H | topic | open | Wikipedia John Seton (priest), Wikidata Q15990275 |
| John Shand | SD1F030WAW | topic | open | Wikipedia John Shand, Wikidata Q6257403 |
| John Shepherdson | R3R8WAF9QT | topic | open | Wikipedia John Shepherdson, Wikidata Q37737905 |
| John Smillie | EQB439HWAH | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#4VH9 |
| John Smillie | JSA5YFAWJ8 | topic | open | Wikipedia John Smillie (mathematician), Wikidata Q102205910 |
| John Smith | 29N0X4V8EE | topic | open | Wikipedia John Smith (anatomist and chemist), Wikidata Q6258348 |
| John Smith | G807EWNVHF | unknown | open | Wikipedia List of University of California, Los Angeles people#SC2B |
| John Speidell | B8BRXRF04V | topic | open | Wikipedia John Speidell, Wikidata Q15984704 |
| John Steggall | WSQXB4DPEW | topic | open | Wikipedia John Steggall, Wikidata Q37737959 |
| John Stillwell | AK9K7K9EYP | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#9IEA |
| John Stillwell | FB15CS6XYS | topic | open | Wikipedia John Stillwell, Wikidata Q616266 |
| John Strain | YQJSHBMJ6S | topic | open | Wikipedia John Strain (mathematician), Wikidata Q24261055 |
| John Stuart Hunter | EV2PDKZ5Y1 | topic | open | Wikipedia List of fellows of the American Statistical Association#R2C3 |
| John Stuart Hunter | F13MM40973 | topic | open | Wikipedia John Stuart Hunter, Wikidata Q55991106 |
| John Stuart Mill | 9RAPC128F9 | topic | open | Wikipedia List of logicians#KR1L |
| John Stuart Mill | CSEJ0PREXH | topic | open | Wikipedia John Stuart Mill, Wikidata Q50020 |
| John Stuart Wilson | J6WQ05J8KC | topic | open | Wikipedia John Stuart Wilson, Wikidata Q58227245 |
| John Sturgeon Mackay | D75GJ8YT4S | topic | open | Wikipedia John Sturgeon Mackay, Wikidata Q18912638 |
| John Sulston | E4FQ3AWV6V | unknown | open | Wikipedia List of people by Erdős number#7KV1 |
| John T. Graves | 6KZ33ZS66N | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q940427, ProofWiki Mathematician:John_Thomas_Graves, Wikipedia John T. Graves |
| John T. Riedl | MB0A0V50V6 | unknown | open | Wikipedia List of people by Erdős number#1AS4 |
| John Tate | DFRPGS39EB | topic | open | Wikipedia List of publications in mathematics#UCBV |
| John Tate | K8QJ8KB0KG | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q351822, nLab John Tate, Wikipedia John Tate (mathematician) |
| John Tate | MF5PT4T6KD | topic | open | Wikipedia List of people by Erdős number#0S97, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#L9W8, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#YPG1 |
| John Terning | KPCW1PFNCC | unknown | out_of_scope (a person, not an item of mathematics) | Wikidata Q43200329, nLab John Terning |
| John Tiltman | RZJT3NW7R5 | unknown | open | Wikipedia List of cryptographers#9BU4 |
| John Tipper | 89FHR9S9AE | topic | open | Wikipedia John Tipper (mathematician), Wikidata Q6260903 |
| John Todd | 81BV5H6XYX | unknown | open | Wikipedia List of people by Erdős number#HW19, Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#IJYH |
| John Trevor Stuart | 7HVC126B03 | topic | open | Wikipedia List of International Congresses of Mathematicians Plenary and Invited Speakers#XT4E |
| John Trevor Stuart | 876XWHXB48 | topic | open | Wikipedia John Trevor Stuart, Wikidata Q1530532 |
| John Tromp | 1RG127D3KN | unknown | open | Wikipedia List of people by Erdős number#O5D1 |
| John Truss | JBJ09VZ6YW | topic | open | Wikipedia John Truss, Wikidata Q102135641 |
| John Truss | XWFPW2HJH2 | topic | open | Wikipedia List of people by Erdős number#9G1E |
| John Tukey | QTYJ9R8K99 | topic | open | Wikipedia John Tukey, Wikidata Q382207 |
| John Tukey | S84K1HZPMS | topic | open | Wikipedia List of presidents of the Institute of Mathematical Statistics#I25M |
| John Tukey | SD44C0X0C9 | topic | open | Wikipedia List of people by Erdős number#SROW, Wikipedia List of fellows of the American Statistical Association#O83G |