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CaseSingularPlural
Nominativeименительный · кто? что?мужчина мужчины the subject: who or what acts
Accusativeвинительный · кого? что?мужчину мужчин the direct object of the verb
Genitiveродительный · кого? чего?мужчины мужчин possession, absence, "of"-phrases
Dativeдательный · кому? чему?мужчине мужчинам the receiver: to or for someone
Instrumentalтворительный · кем? чем?мужчиной мужчинами the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?мужчине мужчинах location and topics: in, at, about

Мужчина is animate, so its accusative copies the genitive: the form after "I see..." matches the form after "of".

Look up any other word in the Russian declension tool, see where мужчина ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

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