Introduction to N-Deklination

Most German nouns change only in the Genitive singular and in the plural — but a compact, high-frequency group of masculine nouns plays by different rules: they add -n or -en in every case except the Nominative singular. This pattern is called the N-Deklination (weak masculine declension). It covers words you use every day — Kunde, Kollege, Student, Mensch — so mastering it quickly pays off in both speech and writing.

Why N-Deklination Matters

Professional precision: Words like Kunde (client) and Kollege (colleague) appear in every business email and meeting. Using the correct form signals fluency and attention to detail.
Case awareness: N-Deklination forces you to distinguish Nominative from Accusative, Dative, and Genitive — a core skill at every level above A1.
High-frequency vocabulary: Most of these nouns describe people, professions, or animals — words that come up in virtually every conversation.
Formal written German: In letters, the salutation An Herrn Schmidt requires the weak form. Getting it wrong marks an otherwise polished letter as amateur.

Understanding N-Deklination

The Core Rule — One Ending, Three Cases

The Nominative singular is the only form without an added ending. In the Accusative, Dative, and Genitive singular, N-declension nouns take -n (if the noun already ends in -e) or -en (otherwise). The article changes to match the case as normal.

Declension Table — der Junge (boy, ends in -e)

Case	Article	Noun Form	Example
Nominative	der	Junge	Der Junge spielt.
Accusative	den	Jungen	Ich sehe den Jungen.
Dative	dem	Jungen	Ich helfe dem Jungen.
Genitive	des	Jungen	Das Spiel des Jungen.

Declension Table — der Student (student, no -e ending)

Nouns not ending in -e add -en in all oblique cases — and crucially, they do not add an extra -s in the Genitive the way regular masculine nouns do (des Hundes vs des Studenten).

Case	Article	Noun Form	Example
Nominative	der	Student	Der Student lernt.
Accusative	den	Studenten	Ich sehe den Studenten.
Dative	dem	Studenten	Ich gebe dem Studenten ein Buch.
Genitive	des	Studenten	Die Tasche des Studenten.

Which Nouns Belong to the N-Declension?

There are four clear groups. Learn these and you will cover almost every weak masculine noun in everyday German.

Group	Pattern	Examples
Group 1	Masculine nouns ending in -e	der Junge, der Kunde, der Kollege, der Experte, der Zeuge, der Löwe, der Hase, der Affe, der Bote, der Neffe
Group 2	Foreign-origin nouns ending in -ant, -ent, -ist, -at, -ot, -et	der Student, der Praktikant, der Polizist, der Diplomat, der Astronaut, der Idiot, der Planet, der Tourist, der Spezialist
Group 3	Animals (mostly ending in -e)	der Bär, der Elefant, der Falke, der Rabe, der Hase, der Affe
Group 4	Common nouns to memorise	der Herr, der Mensch, der Held, der Prinz, der Graf, der Nachbar, der Bauer, der Vorname

The One Exception — Das Herz

The only neuter noun that follows the N-declension pattern is das Herz (heart), and it has its own irregular distribution of endings. It is very common in idioms, so its forms are worth memorising directly.

Case	Form	Example
Nominative	das Herz	Das Herz schlägt.
Accusative	das Herz	Ich fühle das Herz.
Dative	dem Herzen	Er hört dem Herzen zu.
Genitive	des Herzens	Der Schlag des Herzens.

Step-by-Step Guide to Using N-Deklination

Identify the noun: Is it masculine and does it belong to one of the four groups — ending in -e, a foreign suffix (-ant/-ent/-ist), an animal, or a memorised exception like Herr or Mensch?
Determine the case: Is the noun the subject (Nominative), direct object (Accusative), indirect object or after a dative preposition (Dative), or showing possession (Genitive)?
Apply the ending: Nominative → base form, no ending. Accusative, Dative, or Genitive → add -n if the noun ends in -e, or -en otherwise.
Adjust the article: Change the article to match the case — der → den (Accusative), dem (Dative), des (Genitive).
Check the plural: Plural forms are identical to the singular oblique form — die Studenten, die Kunden, die Kollegen. The article signals number and case, not the noun form.

Pro Tip: If you are ever unsure whether a masculine noun is weak, check its plural. Most N-declension nouns form the plural with -en — if the plural ends in -en and the noun refers to a person or animal, it is almost certainly N-Deklination.

Memory Pattern: Think of N-declension nouns as "bare in the Nominative, armoured everywhere else." In the Nominative they stand alone with no ending; the moment they step into any other case they put on their -en shield and keep it on for all three remaining cases.

Key Examples

German	English	Case / Note
Der Kunde wartet.	The customer is waiting.	Nominative singular — no ending
Ich berate den Kunden.	I advise the customer.	Accusative singular — Kunden
Ich helfe dem Kunden.	I help the customer.	Dative singular — Kunden
Die Rechnung des Kunden.	The customer's invoice.	Genitive singular — Kunden
Wir haben viele Kunden.	We have many customers.	Plural — same form as singular oblique
Der Herr kommt.	The gentleman arrives.	Nominative — no ending
Ich kenne den Herrn.	I know the gentleman.	Accusative — Herrn
Ich schreibe dem Herrn.	I write to the gentleman.	Dative — Herrn
Die Kollegen arbeiten zusammen.	The colleagues work together.	Plural Nominative — Kollegen
Wir besuchen den Praktikanten.	We visit the intern.	Accusative — Praktikanten
Das Buch gehört dem Studenten.	The book belongs to the student.	Dative — Studenten
Er hört dem Herzen zu.	He listens to the heart.	Dative of das Herz — irregular Herzen

Common Mistakes

Mistake 1: Ich sehe der Polizist.
- Fix: Polizist is an N-declension noun and here it is the Accusative object. The article must change to den and the noun takes -en. Correct: Ich sehe den Polizisten.
Mistake 2: Das Buch des Student.
- Fix: N-declension nouns in the Genitive take -en — they do not add an extra -s like regular masculine nouns. Correct: Das Buch des Studenten.
Mistake 3: Der Junge spielt mit den Junge.
- Fix: After the dative preposition mit, the weak noun must take its oblique ending. Correct: Der Junge spielt mit dem Jungen.
Mistake 4: Die Herren ist nett.
- Fix: Herren is plural and requires a plural verb. In the singular, der Herr takes no ending in the Nominative. Correct: Der Herr ist nett. or Die Herren sind nett.
Mistake 5: Ich spreche mit den Kunde.
- Fix: After mit (Dative), the N-declension ending is required. Correct: Ich spreche mit dem Kunden.
Nuance 1: der Doktor looks like an N-declension noun but is strong.
- Fix: der Doktor follows regular strong declension — Genitive is des Doktors, not des Doktoren. Always check a dictionary if you are unsure whether a foreign-sounding masculine noun is weak or strong.
Nuance 2: In informal spoken German, the N-declension ending is sometimes dropped in Dative.
- Fix: Dropping the ending (mit dem Kollege) does occur in casual speech but is considered an error in writing. As a learner, always use the full ending — it is universally correct in every register.

Pronunciation Guide

Junge / Jungen – YOONG-e / YOONG-en – Der Junge kennt den Jungen.
Kunde / Kunden – KOON-de / KOON-den – Der Kunde schreibt dem Kunden.
Student / Studenten – shtoo-DENT / shtoo-DEN-ten – Der Student hilft dem Studenten.
Herr / Herrn – HER / HERN – Der Herr grüßt den Herrn.
Mensch / Menschen – MENSH / MENSH-en – Der Mensch braucht den Menschen.
Kollege / Kollegen – ko-LAY-ge / ko-LAY-gen – Der Kollege kennt den Kollegen gut.

Cultural Insights

A relic of old Germanic: The N-Deklination is a direct survival of an ancient Germanic noun class that marked case with a nasal suffix. Modern German preserved it because the affected nouns — people, animals, roles — were so embedded in everyday speech that the pattern never eroded.
Professional register: In business German, misusing N-Deklination with Kunde or Kollege is a noticeable beginner signal. Emails, contracts, and presentations that get these forms right convey professionalism. Those that don't quietly undermine it.
Formal correspondence: German postal and email salutations conventionally write An Herrn Schmidt (To Mr Schmidt) — the Accusative of Herr is required because the name is a direct object of an. Omitting the -n marks an otherwise careful letter as careless.
Regional variation: In Swiss German and parts of southern Germany, weak endings are frequently dropped in colloquial speech. In formal and written standard German, however, they are mandatory everywhere in Germany, Austria, and Switzerland alike.

Practice Scenarios

At the Office: Writing and speaking about clients and colleagues, e.g., Ich habe mit dem Kunden gesprochen. (I spoke with the client.)
- Bitte rufen Sie den Kollegen an.
- Ich schreibe eine E-Mail an Herrn Müller.
- Wir brauchen einen Experten für dieses Projekt.
At the Zoo: Describing animals in different cases, e.g., Die Kinder sehen den Löwen. (The children see the lion.)
- Ich gebe dem Affen einen Apfel.
- Die Zähne des Löwen sind scharf.
- Der Falke beobachtet den Hasen.
University Life: Talking about students and interns, e.g., Ich helfe dem Studenten bei seiner Hausarbeit. (I help the student with his essay.)
- Die Wohnung des Studenten ist klein.
- Wir treffen den Praktikanten im Café.
- Die Professoren kennen die Studenten gut.
Formal Letter: Using the correct salutation and address, e.g., An Herrn Dr. Wagner, sehr geehrter Herr Wagner.
- Sehr geehrter Herr Kollege...
- Ich wende mich an den zuständigen Experten.
- Mit freundlichen Grüßen an Herrn Direktor Schmidt.

Follow-Up Questions

How do I know whether a masculine noun follows N-Deklination?
- Example Answer: Look for an -e ending (der Kunde), a foreign suffix like -ant, -ent, or -ist (der Student, der Polizist), or check whether the plural ends in -en and refers to a person or animal. Memorise the short list of exceptions: der Herr, der Mensch, der Held, der Bauer.
What happens to N-declension nouns in the Genitive — do they add -s?
- Example Answer: No. Unlike regular masculine nouns (des Hundes), N-declension nouns take only -en in the Genitive — never an additional -s. So it is des Kunden, des Studenten, des Kollegen.
Why does das Herz behave differently from all other N-declension nouns?
- Example Answer: Herz is the only neuter noun in this pattern and it retained an older inflectional form. It takes -en in the Dative (dem Herzen) and -ens in the Genitive (des Herzens), but the Accusative is identical to the Nominative (das Herz).
Can N-declension nouns be used with indefinite articles?
- Example Answer: Yes, and the endings on the noun remain exactly the same. The article changes as usual: ein Kunde (Nom), einen Kunden (Akk), einem Kunden (Dat), eines Kunden (Gen).
Is it ever acceptable to drop the N-declension ending in speech?
- Example Answer: In very informal spoken German some speakers drop it, especially in the Dative. However, this is considered non-standard. In writing and in any formal or professional context the ending is always required — so it is safest to use it consistently everywhere.

Conclusion

N-Deklination is a compact rule with an outsized impact on your German. By learning the four groups and applying the single principle — -n or -en in every case except the Nominative — you immediately improve your precision in speech, writing, and formal correspondence. The next logical step is to practise these same nouns inside complex sentences with relative clauses, where the case of the noun inside the clause must be determined independently of the main clause.

Practice Makes Perfect

In the exercises below you will fill in the correct N-declension forms in context sentences, choose the right article for each case, and convert singular sentences to plural. Pay particular attention to der Herr and der Kunde — they are the most frequent weak masculine nouns in real professional German.