The Dynamo Dresden centre-half, 25, has put pen to paper on a three-year deal and will officially link up with the club on July 1 when he is a free agent.
Hefele’s arrival follows on from the capture of another German defender in left-back Chris Lowe, who will join the club in the summer from FC Kaiserslautern.
And Hefele, a 6ft 4 in centre-back, admits he is relishing starting his English adventure after captaining Dresden to promotion in the 3.Bundesliga.
Hefele, head coach David Wagner’s second signing from his native Germany, said:“My agent told me about one month ago about the offer from Huddersfield and I was very excited.
“It is a childhood dream come true. I always wanted to play in England because of the style English players play. It has very physical, strong players and is very tough. I like it that way.
“In Germany, it is difficult when you make a tackle or go up for a header. You don’t have to touch the player and the referee is blowing and it’s a free-kick or you maybe get a yellow card. Here, you can tackle.”
Hefele’s new club played out a 1-1 draw in Tuesday’s Yorkshire derby at Rotherham United, who extended their superb unbeaten sequence to 10 matches under Neil Warnock.
Rotherham’s current sequence is the best at this level since the spring of 1981-82 when the side, managed by Emlyn Hughes, memorably went 11 second-tier matches without defeat, winning 10 along the way.
If the Millers avoid defeat at Wolves on Saturday, they will equal that unbeaten run, with Warnock having challenged his side to avoid defeat between now and the end of the campaign, while supporters keep their fingers crossed he will extend his time at the club later this spring.
Warnock, whose side need one more point to mathematically rubberstamp safety, said: “At the end of the season, we are going to talk when the games are finished.
“First of all, you have got to get over the line.
“Mathematically, we are not quite safe, but after this draw, we are as good as and the chairman and I are talking all the time and we have told each other about our situations.
“We will be talking over the next couple of weeks about next season.
“But at the moment, it’s on hold.”