Prepositions and Case: Overview | Icelandic Grammar

Here is the one rule that organises every Icelandic preposition: a preposition governs a case. It does not merely sit in front of a noun the way English "to" or "with" does — it forces the following noun (and its article and any adjectives) into a specific case, reshaping the endings. Each preposition demands the accusative, the dative, or the genitive; and a small, very high-frequency group demands two cases, choosing between them according to meaning. English speakers tend to ignore this entirely, because "to the school," "from the school," and "with the school" leave school untouched. In Icelandic the noun changes every time. This page sorts the prepositions into their four groups and shows the one alternation worth more than all the rest: accusative for motion, dative for location.

Every preposition fixes a case

In English, a preposition is grammatically inert toward its noun. In Icelandic it is the governor: it assigns the case, exactly the way a verb assigns case to its object. Watch the definite masculine noun skólinn ("the school") change under three different prepositions:

Preposition	Case it governs	Result	Meaning
um	accusative	um skólann	about the school
frá	dative	frá skólanum	from the school
til	genitive	til skólans	to the school

Same noun, three prepositions, three different endings: skólann (acc.), skólanum (dat.), skólans (gen.). The case is a fixed property of the preposition — you learn it together with the word, just as you learn a verb's case.

Við töluðum um skólann allan daginn.

We talked about the school all day. 'um' governs the accusative → 'skólann'.

Hún gekk heim frá skólanum.

She walked home from the school. 'frá' governs the dative → 'skólanum'.

Strákurinn hljóp til skólans.

The boy ran to the school. 'til' governs the genitive → 'skólans'.

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Learn every preposition with its case, like a label: um + acc., frá + dat., til + gen. The case is not deducible from the meaning — it is part of the word, and the noun's ending always shows it.

The four groups

Accusative-only prepositions

A relatively small set always takes the accusative. The most common are um ("about / around"), gegnum ("through"), kringum ("around"), and umfram ("beyond").

Við keyrðum í gegnum bæinn án þess að stoppa.

We drove through the town without stopping. 'gegnum' + accusative → 'bæinn'.

Það var girðing í kringum garðinn.

There was a fence around the garden. 'kringum' + accusative → 'garðinn'.

Dative-only prepositions

A large group always takes the dative — this is one of the biggest preposition classes. Core members: af ("off / of"), frá ("from"), hjá ("at / with [someone]"), með ("with," in the accompaniment sense), úr ("out of"), að ("towards / to"), gagnvart ("towards / vis-à-vis"), handa ("for [the benefit of]").

Ég fékk pakka frá ömmu minni.

I got a parcel from my grandmother. 'frá' + dative → 'ömmu minni'.

Hann tók bókina úr töskunni.

He took the book out of the bag. 'úr' + dative → 'töskunni'.

Ég bý hjá foreldrum mínum þangað til í haust.

I'm living with my parents until the autumn. 'hjá' + dative → 'foreldrum mínum'.

Genitive-only prepositions

A small but important set takes the genitive: til ("to"), án ("without"), vegna ("because of"), milli / á milli ("between"), auk ("besides / in addition to"), sökum ("on account of").

Ég kemst ekki í gang án kaffis á morgnana.

I can't get going without coffee in the mornings. 'án' + genitive → 'kaffis'.

Leiðin liggur milli fjallanna tveggja.

The route runs between the two mountains. 'milli' + genitive → 'fjallanna'.

Við frestuðum ferðinni vegna veðursins.

We postponed the trip because of the weather. 'vegna' + genitive → 'veðursins'.

Two-case prepositions: accusative OR dative

Now the famous group — and the single most valuable preposition rule in Icelandic. A set of common prepositions governs both accusative and dative, and the choice carries meaning: accusative for motion toward / change of location, dative for static location / no movement. The core members are í ("in / into"), á ("on / onto"), undir ("under"), yfir ("over"), fyrir ("for / in front of"), and með ("with," in some uses). (If you have met German, this is the Wechselpräposition idea — but the test in Icelandic is sharper, as the dedicated page explains.)

Ég fer í skólann klukkan átta.

I go to school at eight. Motion INTO → 'í' + accusative → 'skólann'.

Ég er í skólanum til klukkan þrjú.

I'm at school until three. Static location IN → 'í' + dative → 'skólanum'.

That minimal pair — í skólann (going in, accusative) versus í skólanum (being there, dative) — is the whole system in two words. The preposition í never changes; only the noun's ending shifts, from -nn (accusative) to -num (dative), to mark motion versus rest. The same logic runs through á, undir, yfir, and the others, and it is drilled in full on two-case prepositions.

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The acc/dat alternation is the highest-value preposition rule in Icelandic. Learn it once — accusative = into / onto (motion), dative = in / on (static) — and you unlock í, á, undir, yfir, fyrir all at the same time. Master this before memorising long single-case lists.

How to read the case off the noun

You never see the case on the preposition itself — í, á, að are tiny invariable words. The case shows up entirely on the noun, article, and adjective that follow. So to confirm you've got it right, look at the ending:

Hann setti bækurnar á borðið.

He put the books on the table. Motion onto → 'á' + accusative → neuter 'borðið'.

Bækurnar liggja á borðinu.

The books are lying on the table. Static → 'á' + dative → 'borðinu' (note the dative -inu).

For neuter nouns like borð, the accusative and dative look more alike than for masculines, but the article still distinguishes them: accusative borðið versus dative borðinu. For masculines the contrast is loud — skólann versus skólanum — so masculine examples are the clearest place to feel the rule.

Common Mistakes

❌ Ég fer til skólinn.

Incorrect — 'til' governs the genitive; leaving the noun in its dictionary/nominative form is wrong.

✅ Ég fer til skólans.

I'm going to the school. 'til' + genitive → 'skólans'.

❌ Ég kem frá Reykjavík (left unchanged where a form is needed) → 'frá Reykjavíkur'

Incorrect — 'frá' takes the dative, not the genitive; Reykjavík stays Reykjavík in the dative.

✅ Ég kem frá Reykjavík.

I come from Reykjavík. 'frá' + dative (Reykjavík is unchanged in the dative here).

❌ Ég er í skólann núna.

Incorrect — you ARE somewhere (static), so it must be dative, not the motion accusative.

✅ Ég er í skólanum núna.

I'm at school now. Static location → 'í' + dative → 'skólanum'.

❌ Hún gekk í gegnum garðinum.

Incorrect — 'gegnum' is accusative-only; it never takes the dative.

✅ Hún gekk í gegnum garðinn.

She walked through the garden. 'gegnum' + accusative → 'garðinn'.

❌ Treating every preposition like English and leaving the noun unchanged.

Incorrect — in Icelandic the noun's ending must reflect the case the preposition governs.

✅ um skólann / frá skólanum / til skólans

About / from / to the school. Three prepositions, three cases, three endings.

Key Takeaways

Every preposition governs a case: accusative, dative, or genitive — it reshapes the following noun's ending.
Accusative-only: um, gegnum, kringum, umfram.
Dative-only (the largest group): af, frá, hjá, með, úr, að, gagnvart, handa.
Genitive-only: til, án, vegna, milli, auk, sökum.
Two-case (í, á, undir, yfir, fyrir, með): accusative for motion, dative for location — the most important rule of all.
The case never shows on the preposition (í, á, að are invariable); it shows on the noun, article, and adjective.
Learn each preposition with its case as a fixed label — the case is not predictable from meaning.

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