| in regard to | względem |
| in relation to | względem |
| In Salah | Ajn Salih |
| In Search of Lost Time | W poszukiwaniu straconego czasu |
| In Search of Santa | Gdzie jest święty Mikołaj |
| In Search of the Castaways | Dzieci kapitana Granta |
| in sequence | kolejno |
| in short | jednym słowem |
| in single file | gęsiego |
| in situ | w miejscu |
| In situ hybridization | Fluorescencyjna hybrydyzacja in situ |
| in spite of | mimo |
| in sum | jednym słowem |
| In the Air Tonight | In the Air Tonight |
| In the Bedroom | Za drzwiami sypialni |
| in the beginning | na początku |
| in the evening | wieczorem |
| in the face of | wobec |
| in the first instance | na początku |
| In the Fishtank | In The Fishtank |
| In the Garden of Venus | In The Garden Of Venus |
| In the Hall of the Mountain King | W grocie Króla Gór |
| In the Line of Fire | Na linii ognia |
| in the mean time | tymczasem |
| in the meantime | tymczasem |
| in the middle | pośrodku |
| in the morning | rano |
| in the name of | w imię |
| In the Name of the Father | W imię ojca |
| In the Nightside Eclipse | In the Nightside Eclipse |
| in the open | pod gołym niebem |
| in the past | dawniej |
| in the presence of | wobec |
| in the short run | na początku |
| in the sweat of one's brow | w pocie czoła |
| in the twinkling of an eye | w mgnieniu oka |
| In the Zone | In the Zone |
| in vain | darmo |
| in vitro assay | analiza in vitro |
| In vitro fertilisation | Zapłodnienie In Vitro |
| In vitro fertilization | Zapłodnienie In Vitro |
| in vivo assay | analiza in vivo |
| In with the Out Crowd | In with the Out Crowd |
| in- | nie- |
| In-air refuelling | Powietrzny tankowiec |
