"us" (as the recipient of an action, often used in addressing a group)

"हमें"

English Usage: "They invited nobis to the party."

Hindi Usage: "उन्होंने हमें पार्टी में आमंत्रित किया।"

"we" (used as a subject in a sentence, referring to the speaker and others)

"हम"

English Usage: "Nobis will lead the project."

Hindi Usage: "हम परियोजना का नेतृत्व करेंगे।"