 | ÍA (Akranes), Iceland |
| ÍBA (Akureyri), Iceland |
 | Ibar (Rožaje), Montenegro |
| ÍBH (Hafnarfjörður), Iceland |
| ÍBI (Ísafjörður), Iceland |
 | Ibiraçu Esporte Clube (Ibiraçu ), Brazil |
 | Ibstock Colliery, England |
| Ibstock Penistone Rovers, England |
| ÍBV (Vestmannaeyjar), Iceland |
| ICI Alkali, England |
 | Ideal Boys, Montserrat |
 | Idel (Kazan), Russia |
 | Ifeanyi Ubah (Nnewi), Nigeria |
 | Ifira Black Bird (Port Vila), Vanuatu |
 | IFK Luleå (Luleå), Sweden |
| IFK Malmö (Malmö), Sweden |
| IFK Sundsvall (Sundsvall), Sweden |
 | Ifodjè (Atakpamé), Togo |
| Igalo (Igalo), Montenegro |
 | Igilik (Qaratau), Kazakhstan |
 | Igloopol (Dębica), Poland |
 | IgroServis (Simferopol), Ukraine |
| Iguatu (Iguatu), Brazil |
 | III. Kerületi TUE (Budapest), Hungary |
 | Ikast (Ikast), Denmark |
| Ikva (Mlyniv), Ukraine |
 | Ilaoa and To'omata (Pago Pago), American Samoa |
| Ile-Saulet (Almaty Region), Kazakhstan |
| Ilford (London), England |
| Ilfracombe Town (Ilfracombe), England |
| Ilkeston (Ilkeston), England |
| Ilkeston (Ilkeston), England |
| Ilkeston United, England |
| Illichovets-2 (Mariupol), Ukraine |
| Ilminster Town, England |
| Ilpar (Ilyinsky), Russia |
 | Ilūkstes NSS (Ilūkste), Latvia |
 | Ilves (Tampere), Finland |
| Immingham, England |
| Immingham Town, England |
| Imperial Paper Mills, England |
 | Impôts (Yaoundé), Cameroon |
 | Impuls (Dilijan), Armenia |
 | Impuls (Dilizhan), USSR |
| Impuls (Kamyanets-Podilskyi), Ukraine |
 | IMT (Belgrade), Serbia |
 | Incheon United (Incheon), South Korea |
| Independência Futebol Clube (Rio Branco), Brazil |
| Independente (Tucuruí), Brazil |
| Independente Esporte Clube (Santana), Brazil |
 | Independente Tomboa (Tomboa), Angola |
 | Independiente (Avellaneda), Argentina |
 | Independiente (Medellín), Colombia |
| Independiente (Tandil), Argentina |
 | Independiente de Campo Grande (Asunción), Paraguay |
 | Independiente del Valle (Sangolquí), Ecuador |
 | Independiente La Chorrera (La Chorrera), Panama |
 | Independiente Nacional 1906 (San Vicente), El Salvador |
 | Independiente Petrolero (Sucre), Bolivia |
| Independiente Rivadavia (Mendoza), Argentina |
 | Indera, Brunei |
| Industria (Yenakievo), USSR |
| Industry Inn, England |
 | Ingolstadt 04 (Ingolstadt), Germany |
| Ingulets (Petrove), Ukraine |
| Ingulets-2 (Petrove), Ukraine |
 | Inkaras (Kaunas), Lithuania |
| Inkaras (Kaunas), USSR |
 | Inshaatchi (Baku), Azerbaijan |
| Inshaatchi (Sabirabad), Azerbaijan |
| Inshaatchi (Shemakha), USSR |
| Instituto (Córdoba), Argentina |
| Instituto de Administração de Projetos Educacionais Futebol Clube (São Luís), Brazil |
| Intehral (Vinnytsia), Ukraine |
| Inter (Boyarka), Ukraine |
 | Inter (Bratislava), Czechoslovakia |
 | Inter (Bratislava), Slovakia |
| Inter (Cherkessk), Russia |
| Inter (Limeira), Brazil |
 | Inter (Milan), Italy |
| Inter (Santa Maria), Brazil |
| Inter (Turku), Finland |
 | Inter (Zaprešić), Croatia |
 | Inter Bom-Bom, São Tomé and Príncipe |
 | Inter Club (Brazzaville), Congo |
 | Inter Club d'Escaldes (Escaldes-Engordany), Andorra |
| Inter de Lages (Lages), Brazil |
 | Inter de Litoral Academy, Equatorial Guinea |
 | Inter Miami (Miami), USA |
 | Inter Moengotapoe (Moengo), Suriname |
 | Inter Monaro (Queanbeyan), Australia |
| Inter-Giuliana (New York City), USA |
| Interas (Visaginas), Lithuania |
 | Interblock (Ljubljana), Slovenia |
| Interclube (Luanda), Angola |
| Internacional (Lages), Brazil |
| Internacional (Porto Alegre), Brazil |
| Interporto Futebol Clube (Porto Nacional), Brazil |
| Inturist (Yalta), Ukraine |
 | Inverness (Inverness), Scotland |
 | Invincible Eleven (Monrovia), Liberia |
| Inđija (Inđija), Serbia |
 | Iōnikós (Nikaías), Greece |
| Ipatinga (Ipatinga), Brazil |
| Ipswich Town (Ipswich), England |
| Ipswich Wanderers (Ipswich), England |
| Ipswich Works, England |
| ÍR (Reykjavík), Iceland |
 | IR Tanger (Tangier), Morocco |
| Īraklī́s (Thessaloniki), Greece |
 | Iraq U23 (Baghdad), Iraq |
| Iraty Sport Club (Iraty), Brazil |
| Irchester United (Irchester), England |
| Irgiz (Balakovo), Russia |
| Iriston (Vladikavkaz), USSR |
| Irkutsk (Irkutsk), Russia |
| Irlam (Salford), England |
| Irlam Town, England |
| Ironbridge, England |
| Ironbridge United, England |
| Irpin (Horenychy), Ukraine |
| Irrigator (Chardzhou), USSR |
| Irthlingborough Diamonds (Irthlingborough), England |
| Irthlingborough Town, England |
| Irtysh (Glubokov), USSR |
| Irtysh (Omsk), Russia |
| Irtysh (Omsk), USSR |
| Irtysh (Pavlodar), Kazakhstan |
| Irtysh (Pavlodar), USSR |
| Irtysh-2 (Pavlodar), Kazakhstan |
| Irwell Springs, England |
 | Iserlohn (Iserlohn), FRG |
| Isidro Metapán (Metapán), El Salvador |
 | Iskar (Sofia), Bulgaria |
 | Iskra (Bugojno), Yugoslavia |
| Iskra (Danilovgrad), Montenegro |
| Iskra (Engels), Russia |
| Iskra (Moscow), USSR |
| Iskra (Novoaleksandrovsk), Russia |
| Iskra (Siemianowice Śląskie), Poland |
| Iskra (Smolensk), Russia |
| Iskra (Smolensk), USSR |
| Iskra (Yerevan), USSR |
 | Iskra-Stal (Rîbniţa), Moldova |
| Islington Town, England |
 | Isloch (Minsk District), Belarus |
 | Ismaily SC (Ismaïlia), Egypt |
 | Issia Wazi (Issia), Côte d'Ivoire |
 | İstanbul Başakşehir (Istanbul), Turkey |
| Istanbulspor (Istanbul), Turkey |
 | Istiqlol (Fergana), Uzbekistan |
| Istochnik (Rostov-on-Don), Russia |
| Istra (Pula), Croatia |
| Istra 1961 (Pula), Croatia |
 | Istres (Istres), France |
| Itabaiana (Itabaiana), Brazil |
| Itabuna (Itabuna), Brazil |
| Italiano (Ciudad Evita), Argentina |
| Ittihad Khemisset (Khémisset), Morocco |
| Ituano (Itu), Brazil |
| Itumbiara (Itumbiara), Brazil |
| Itzehoer SV (Itzehoe), FRG |
| Ivančna Gorica (Ivančna Gorica), Slovenia |
 | Iveria (Khashuri), Georgia |
| Ivinhema Futebol Clube (Ivinhema), Brazil |
| Izhotsky Factory (Leningrad), USSR |
| Izola (Izola), Slovenia |
| Izumrud-Neftyanik (Timashyovsk), Russia |
