Danish grammar is either the study of the grammar of the Danish language, or the grammatical system itself of the Danish language. Danish is often described as having ten word classes: verbs, nouns, pronouns, numerals, adjectives, adverbs, articles, prepositions, conjunctions, and interjections. The grammar is mostly suffixing. This article focuses on Standard Danish.

There are two grammatical genders in Danish: common and neuter. All nouns are mostly arbitrarily divided into these two classes. The singular indefinite article (a/an in English) is en for common-gender nouns and et for neuter nouns. They are often informally called n-words and t-words.

En dreng. A boy.

Et fængsel. A jail.

Unlike English, definite nouns in Danish are rendered by adding a suffix (i.e. not an article) to the indefinite form (unless qualified by an adjective; see below). The definite singular ending is -en for common-gender nouns and -et for neuter nouns.

Drengen. The boy.

Fængslet. The jail.

The plural noun suffixes are more complex. The following table shows the possible inflections of regular Danish nouns of both grammatical genders.