| Ibn Sahl | QKT8XC5APS | unknown | open | Wikipedia List of Iranian mathematicians#BIXN |
| Ibn Taymiyyah | 11HTEHMQFN | unknown | open | Wikipedia List of logicians#W3HL |
| Ibn Wahshiyya | XGB58R5X51 | unknown | open | Wikipedia List of cryptographers#6BQ3 |
| Ibn Yunus | T8417493DS | topic | open | Wikipedia Ibn Yunus, Wikidata Q459921 |
| IBOPE | QWYE9RMK4W | unknown | open | Wikipedia List of polling organizations#VTJE |
| Ibragimov–Iosifescu conjecture for φ-mixing sequences | 844KSKRY6G | statement | open | Wikipedia List of unsolved problems in mathematics#PWCN |
| Ibragimov–Iosifescu conjecture for φ-mixing sequences | NBNWG8SW8V | statement | open | Wikipedia Ibragimov–Iosifescu conjecture for φ-mixing sequences, Wikidata Q115803023 |
| Ibrahim Eltayeb | NYC2RC0GAW | topic | open | Wikipedia Ibrahim Eltayeb, Wikidata Q71533626 |
| Ibrahim ibn Sinan | RC002ZP0WT | topic | open | Wikipedia Ibrahim ibn Sinan, Wikidata Q2975510 |
| ICD-10-CM | GJPY23FTCB | definition | open | Wikipedia ICD-10-CM, Wikidata Q5969475 |
| ICE | 21YR7Q7A25 | definition | open | Wikipedia ICE (cipher), Wikidata Q1636024 |
| Ice-sheet model | X3ANW1RRQ7 | definition | open | Wikipedia Ice-sheet model, Wikidata Q1319627 |
| Ice-type model | FJVQ9VVDN6 | definition | open | Wikipedia Ice-type model, Wikidata Q5985139 |
| Icelandic Junior College Mathematics Competition | FZ61Z0H3VT | definition | open | Wikipedia Icelandic Junior College Mathematics Competition, Wikidata Q40065581 |
| Icelandic Mathematical Society | QZD1YPH0D7 | definition | open | Wikipedia List of mathematical societies#MOC8 |
| Icelandic Mathematical Society | RJJVY0MDXF | definition | open | Wikipedia Icelandic Mathematical Society, Wikidata Q108936703 |
| Ice–albedo feedback | W27MYGGNSD | definition | open | Wikipedia Ice–albedo feedback, Wikidata Q1310671 |
| ICH E9(R1) addendum on estimands and sensitivity analyses in clinical trials | 7MM8GEKG4Z | definition | open | Wikipedia ICH E9(R1) addendum on estimands and sensitivity analyses in clinical trials, Wikidata Q140068503 |
| Ichinohe | 6B0QG8XWN7 | unknown | open | Wikipedia List of places with numeric names#O8N8 |
| Ichinomiya | VG7385JEV9 | unknown | open | Wikipedia List of places with numeric names#HVXI |
| Ichirō Satake | 24TJ9WJE72 | topic | out_of_scope (a person, not an item of mathematics) | Wikidata Q1656389, nLab Ichiro Satake, Wikipedia Ichirō Satake |
| ICM | H0M6DBXJYZ | unknown | open | Wikipedia List of polling organizations#IF6C |
| ICM Emmy Noether Lecture | PM7DYHB2X3 | unknown | open | Wikipedia Noether Lecture#IRZ9 |
| Iconography of correlations | 4213E7WDVH | definition | open | Wikipedia Iconography of correlations, Wikidata Q3147734 |
| Icons of Mathematics | 948632AH5X | definition | open | Wikipedia Icons of Mathematics, Wikidata Q97179526 |
| icosagon | 1BWA1K59SN | definition | open | Wikidata Q215609, MathWorld TrigonometryAnglesPi20, Wikipedia Icosagon |
| Icosagon | BXPGK7HPSP | definition | open | Wikipedia List of mathematical shapes#3AX7, Wikipedia List of mathematical shapes#DWQJ, Wikipedia List of polygons, polyhedra and polytopes#7440 |
| Icosagon | JN3QPS96TP | definition | open | Wikipedia List of two-dimensional geometric shapes#MVVA |
| icosagonal number | 7CSC5R8HKX | object | open | Wikidata Q18451091, OEIS A051872 |
| Icosahedral 120-cell | B8ENS6TMN4 | definition | open | Wikipedia Icosahedral 120-cell, Wikidata Q3144547 |
| Icosahedral 120-cell | MKXVV0STVK | definition | open | Wikipedia List of mathematical shapes#I4PY, Wikipedia List of polygons, polyhedra and polytopes#NNQS |
| Icosahedral bipyramid | X36ATPFX30 | object | open | Wikipedia Icosahedral bipyramid, Wikidata Q115802241 |
| Icosahedral graph | 9VJPRM6DT5 | unknown | open | Wikipedia Regular icosahedron#7X4T |
| icosahedral graph | C4MW0W9BRN | unknown | open | Wikidata Q3115573, House of Graphs 1186, MathWorld IcosahedralGraph |
| icosahedral group | 1F65SB2TX7 | unknown | open | Wikidata Q25392700, nLab icosahedral group |
| Icosahedral honeycomb | 98SWJ9BENT | object | open | Wikipedia List of mathematical shapes#3J5M, Wikipedia List of mathematical shapes#QWOQ, Wikipedia List of polygons, polyhedra and polytopes#86C6 |
| Icosahedral honeycomb | CVAT98XPBY | object | open | Wikipedia Icosahedral honeycomb, Wikidata Q5986731 |
| icosahedral number | KHNGGAF8RB | definition | open | Wikidata Q13823786, OEIS A006564, Wikipedia Icosahedral number |
| Icosahedral pyramid | DJVMX38G43 | definition | open | Wikipedia Icosahedral pyramid, Wikidata Q18207969 |
| Icosahedral symmetry | 49NWS62P0N | definition | open | Wikipedia List of uniform tilings on the sphere, plane, and hyperbolic plane#X354 |
| icosahedral symmetry | C6HQPZ8CHX | definition | open | Wikidata Q5986738, MathWorld IcosahedralGroup, Wikipedia Icosahedral symmetry |
| icosahedron | EWFZV0BXNP | object | open | Wikidata Q188758, EoM Icosahedron, MathWorld Icosahedron, nLab icosahedron, Wikipedia Icosahedron |
| icosahedron | JR6XAXDZFJ | concept | open | levin_dmoi index/5.3.2/icosahedron |
| Icosian | ZP6G39T7BE | definition | open | Wikipedia Icosian, Wikidata Q17058942 |
| Icosian calculus | 73EFBW73QJ | definition | open | Wikipedia Icosian calculus, Wikidata Q5986733 |
| Icosian game | 4HYNFGEAQJ | concept | open | Wikidata Q4302650, MathWorld IcosianGame, Wikipedia Icosian game |
| Icosidigon | H3SBB6KNWB | definition | open | Wikipedia List of polygons, polyhedra and polytopes#IJ97 |
| icosidigonal number | BGGDQ25W93 | object | open | Wikidata Q18451093, OEIS A051874 |
| Icosidodecadodecahedron | NHEHKKHMWD | object | open | Wikipedia List of polygons, polyhedra and polytopes#KJ66 |
| icosidodecadodecahedron | R4BPKQC9RF | object | open | Wikidata Q147665, MathWorld Icosidodecadodecahedron, Wikipedia Icosidodecadodecahedron |
| icosidodecahedral graph | XEFSWBTV60 | unknown | open | Wikidata Q3115576, House of Graphs 1190, MathWorld IcosidodecahedralGraph |
| icosidodecahedron | G6J9GWG9MV | definition | open | Wikidata Q522554, MathWorld Icosidodecahedron, Wikipedia Icosidodecahedron |
| Icosidodecahedron stellation | WQEVRECBDX | unknown | open | Wikipedia List of Wenninger polyhedron models#TR3R |
| Icosienneagon | HBA2JABHXB | topic | open | Wikipedia List of polygons, polyhedra and polytopes#2AH3 |
| Icosihenagon | MSKJFY9GAK | topic | open | Wikipedia List of polygons, polyhedra and polytopes#WFAX |
| icosihenagonal number | EAZYZ3Z2D0 | object | open | Wikidata Q18451096, OEIS A051873 |
| Icosiheptagon | MKZVS38DEV | topic | open | Wikipedia List of polygons, polyhedra and polytopes#SDI1 |
| Icosihexagon | 9Q7HNTF0HJ | definition | open | Wikipedia List of polygons, polyhedra and polytopes#0G1O |
| Icosikaidigon | 7CYXYRJG02 | definition | open | Wikipedia List of two-dimensional geometric shapes#93VC |
| Icosikaienneagon | 6JW2QYMB30 | topic | open | Wikipedia List of two-dimensional geometric shapes#0GNM |
| Icosikaihenagon | 7YW98Y9R7C | topic | open | Wikipedia List of two-dimensional geometric shapes#BJ68 |
| Icosikaiheptagon | WJPV44BWAV | topic | open | Wikipedia List of two-dimensional geometric shapes#FXOQ |
| Icosikaihexagon | B73WEH3N0S | definition | open | Wikipedia List of two-dimensional geometric shapes#4Y8D |
| Icosikaioctagon | H0DH13FM8B | definition | open | Wikipedia List of two-dimensional geometric shapes#5FNX |
| Icosikaipentagon | A8D47ACW2P | topic | open | Wikipedia List of two-dimensional geometric shapes#N4XO |
| Icosioctagon | 6WRS3BKCQV | definition | open | Wikipedia List of polygons, polyhedra and polytopes#QO79 |
| Icosipentagon | ZBCC1HZZ3V | topic | open | Wikipedia List of polygons, polyhedra and polytopes#3FP3 |
| Icositetrachoric symmetry | AMF3SYRB26 | unknown | open | Wikipedia Point groups in four dimensions#GWP1 |
| Icositetragon | JJT04QMGV5 | definition | open | Wikipedia List of polygons, polyhedra and polytopes#OD50 |
| Icositetragon | PFKF4SDZZN | definition | open | Wikipedia List of two-dimensional geometric shapes#QB3D |
| icositetragon | ZTA6EMNYZN | definition | open | Wikidata Q3546865, MathWorld Icositetragon, Wikipedia Icositetragon |
| icositetragonal number | SE1FY3BKY8 | object | open | Wikidata Q18451098, OEIS A051876 |
| Icositetragram | B7SGSDZGN6 | definition | open | Wikipedia List of polygons, polyhedra and polytopes#Q712 |
| icositetrahedron | 50PKND639X | object | open | Wikidata Q12346647, MathWorld Icositetrahedron, Wikipedia Icositetrahedron |
| Icositrigon | 6VNVFXQ2H4 | definition | open | Wikipedia Icositrigon, Wikidata Q3538667 |
| Icositrigon | BJND348JTZ | definition | open | Wikipedia List of polygons, polyhedra and polytopes#ZSJ8 |
| Icositrigon | RNGF9SJ7JE | definition | open | Wikipedia List of two-dimensional geometric shapes#XV22 |
| icositrigonal number | 2K36S2H8C5 | object | open | Wikidata Q18451099, OEIS A051875 |
| Icositruncated dodecadodecahedron | 1D8YNNZKP4 | object | open | Wikipedia List of polygons, polyhedra and polytopes#3RMB |
| icositruncated dodecadodecahedron | XXV3TX30T1 | object | open | Wikidata Q34287, MathWorld IcositruncatedDodecadodecahedron, Wikipedia Icositruncated dodecadodecahedron |
| ICS Latam | DFQWCTTW5Z | unknown | open | Wikipedia Opinion polls in Venezuela#T7AR |
| ICTM math contest | NTEZ1E55E5 | unknown | open | Wikipedia List of United States regional mathematics competitions#ORX6 |
| ICTP Ramanujan Prize | 6BT7ENEWTF | definition | open | Wikipedia ICTP Ramanujan Prize, Wikidata Q1653280 |
| ID2007 | 48W0T47ED8 | unknown | open | Wikipedia Deprivation index#RCQQ |
| Ida B. Kinney | 8F94QFE1GF | unknown | open | Wikipedia List of University of California, Los Angeles people#X01K |
| Ida Busbridge | DB0JQH3FVX | topic | open | Wikipedia Ida Busbridge, Wikidata Q18810936 |
| Ida Craven Merriam | ABNCV8DNE0 | topic | open | Wikipedia Ida Craven Merriam, Wikidata Q25983104 |
| Ida Craven Merriam | CKVMRRNGF8 | topic | open | Wikipedia List of fellows of the American Statistical Association#UPKR |
| Ida Martha Metcalf | MD9MJ6TWTK | topic | open | Wikipedia Ida Martha Metcalf, Wikidata Q23074259 |
| Ida May Schottenfels | FCVYRJJ44D | topic | open | Wikipedia Ida May Schottenfels, Wikidata Q75100301 |
| Ida Rhodes | 5PEVD81Z14 | unknown | open | Wikipedia List of Jewish mathematicians#G6HW |
| Ida surface | ED3QM5XBSK | definition | open | Wikipedia Ida surface, Wikidata Q141497745 |
| IDE Research Centre @ Institut Darul Ehsan (IDE) | KBYPZZEFYN | unknown | open | Wikipedia List of polling organizations#SYXZ |
| IDEA | PYH7YT8ZKY | definition | open | Wikipedia List of cryptosystems#RKHZ |
| IDEA NXT | 4EHY5CS3NJ | definition | open | Wikipedia IDEA NXT, Wikidata Q1389431 |
| ideal | 7K2V431N0Y | definition | node (a node has the same Wikidata item as the row) | Wikidata Q44649, EoM Ideal, MathWorld Ideal, ProofWiki Definition:Ideal_of_Ring, Wikipedia Ideal (ring theory) |
| Ideal | C5JWEHQ94N | 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 2610.17137#GX2W |
| ideal | J5BWE49529 | definition | open | Wikidata Q1656686, MathWorld PartialOrderIdeal, Wikipedia Ideal (order theory) |
| ideal | MWJGF2RT99 | definition | open | Wikipedia Glossary of commutative algebra#4889 |
| Ideal | NBV2HQ3DF6 | definition | open | Wikipedia List of order theory topics#LL7U |