The 25-year-old spent the end of last season on loan at Easter Road, scoring eight goals in 15 games including a hat-trick against Rangers on the final day of the campaign.
Maclaren expressed his delight at returning to Hibs for a second loan spell given the success of his previous stay in Leith.
"A few factors drove me to come back," the Australian told the official Hibs website. "With the success that we had last season it just breeds confidence throughout the squad and, for me, scoring goals was important.
"After having the World Cup experience I want to kick on. This is the best club for me to be at to kick on.
"I think having a manager like Neil Lennon who backs me and every player in the squad, that's who you want to play for. And the fans have also been on at me on social media since the break, so it's nice to be wanted and valued. I'm just glad I'm here."
Maclaren will go straight into the Hibs squad to face Motherwell at home in Sunday's Scottish Premiership opener.