The 30-year-old joined Fulham from Tottenham Hotspur last year, making 12 appearances for the Cottagers in the Championship during the 2021-22 campaign.
Gazzaniga has not made a Premier League squad for Fulham this term, though, while he was only on the bench for their EFL Cup clash with Crawley Town on August 23.
Having dropped to third-choice stopper, the Argentina international has left Craven Cottage in search of first-team football.
"Paulo Gazzaniga has joined Girona on loan for the duration of 2022/23 season," read a statement on Fulham's official website.
"Girona currently occupy 13th spot in La Liga, and travel to Mallorca for their next fixture on Saturday.
"It's a third spell in Spain for Paulo, having previously represented Rayo Vallecano and Elche, and we wish him the very best of luck for the remainder of the campaign."
Gazzaniga came through the youth system at Valencia before joining Gillingham, while he spent five years with Southampton ahead of a move to Tottenham.
Leicester 
Chelsea 
Valencia 
Betis 
Dynamo Kyiv 
Chornomorets Odesa 
Verona 
Inter 
Bayer Leverkusen 
FC Heidenheim 
Borussia Dortmund 
SC Freiburg 
VFL Wolfsburg 
Union Berlin 
Arsenal 
Nottingham Forest 
Everton 
Brentford 
Spartak Moscow 
Lokomotiv Moscow 
Atletico Madrid 
Alaves 
Rangers 
Dundee Utd 
Lens 
Marseille 
Ingulets Petrove 
Shakhtar Donetsk 
AC Milan 
Juventus 
ST Malo 
Bordeaux 
Manchester City 
Tottenham 
Eintracht Frankfurt 
Werder Bremen 
Girona 
Espanyol 
Feyenoord 
Heerenveen 
ST Etienne 
Montpellier 
Grenoble Foot 38 
Heart Of Midlothian 
Celtic 
Reims 
Lyon 
PSV 
Groningen 
Celta Vigo 
Barcelona 
Benfica 
Estrela Da Amadora 
Sparta Rotterdam 
AZ Alkmaar 
Southampton 
Liverpool 
Como 
Fiorentina