Why is it die Hotellerie?

Hotellerie ends in -ie, and nouns ending in -ie are feminine: in a German dictionary, 98% of them take die.

All nouns ending in -ie
Sense 1
die

Meaning

[1] Complete of the hotels with their services

[1] Gesamtheit der Hotels mit ihren Dienstleistungen

Examples

[1] "He had actually planned to go on a hike through the hotel industry through the hotel industry after his training as a hotel specialist"

[1] „Der hatte eigentlich geplant, sich nach dem Ende seiner Ausbildung zum Hotelfachmann auf Wanderschaft durch die Hotellerie Europas zu begeben.“

Declension

1 Singular Plural
Nominativ die Hotellerie —
Genitiv der Hotellerie —
Dativ der Hotellerie —
Akkusativ die Hotellerie —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary