Forest boss Stuart Pearce made seven changes to the side that stormed to a 4-0 victory over Reading at the weekend.
The stand-out change was the return of talismanic midfielder Henri Lansbury, making his first appearance of the season following a lengthy injury absence.
The first half saw both teams with chances to take the lead, Huddersfield hitting the post through Jon Stead and Forest coming close through Lars Veldwijk and Michail Antonio respectively.
Lansbury looked sharp, pulling the strings in midfield while the other replacements were enthusiastic in their eagerness to impress.
The Reds went into the dressing room marginally on top and made a half-time substitution with Chris Burke replacing Antonio.
Forest continued to press in the second-half and looked on top for long periods.
However the Reds had to wait till the 72nd minute to break the deadlock, and in bizarre fashion.
A Jamie Paterson corner looked like an easy clearance for Huddersfield striker James Vaughan, but he inexplicably headed the ball into his own net, gifting Forest the lead.
Lansbury sealed the win 10 minutes later with a clever toe-poked finish from the edge of the area and in doing so sent Forest into the third round of the Capital One Cup.
“I don’t feel as though we weakened the team tonight, despite the changes,” Forest assistant manager Steve Wigley told BBC Radio Nottingham.
“We controlled the game for large periods and came out as worthy winners.
“We had full confidence that we could step up to the plate and win this game and we want to continue to do well in this competition.”
The Capital One Cup third round draw will take place tomorrow evening with Forest’s next game away against Sheffield Wednesday this Saturday at 12:15pm.
Huddersfield Town: Murphy, Smith (Holmes – 73′ ), Wallace, Dixon, Lynch, Bunn (Vaughan – 61′ ), Ward, Coady, Butterfield, Hammill, Stead (Scannell – 78′ ). Subs not used: Smithies, Sinnott, Crooks, Billing.
Nottingham Forest: Darlow, Lichaj, Lascelles, Mancienne, Hunt, Tesche, Osborn, Lansbury, Antonio (Burke – 45’ ), Paterson (Fryatt 79’ ), Veldwijk (Assombalonga – 66’ ). Subs not used: Harding, Fox, McLaughlin, Durrant.
Attendance: 6,509 (1,555 away)