The Slav Defense is the closest. It is often recommended as a 1.d4 answer in repertoires also containing the Caro-Kann.
Response to 1. d4 similar to Caro-Kann?

Thanks for the reply! The Slav evolves out of the Queen's gambit refused, right? I'll take a look at it.
The positions arising arent exactly similar. One of the very critical lines goes

Excellent ideas folks, thanks! I guess my next question would be this: For those of you who open with 1. d4, and if I were to answer with 1. ... c6, would you continue with the Queen's gambit, or play something else?

I think most people who open with d4 are not looking to transpose to an e4 opening (such as the Caro-Kann). Of course, if you enjoy playing the Caro-Kann, it's not a terrible thing to do -- I just wouldn't expect to see 1. d4 c6 2. e4 very often, at least from people (computers will transpose, as they of course don't have preferences the same way people do).
Excellent ideas folks, thanks! I guess my next question would be this: For those of you who open with 1. d4, and if I were to answer with 1. ... c6, would you continue with the Queen's gambit, or play something else?
I would definatly proceed with the QG or perhaps go into a catalan.

The Slav does not have the exact same positions as the C-K, but the pawn structure ('horns' on c6 amd e6) are quite similar.

Does anyone have any highly tactical line for black after the boring 1.d4 ?
Well, try the Budapest Gambit.
I think most people who open with d4 are not looking to transpose to an e4 opening (such as the Caro-Kann). Of course, if you enjoy playing the Caro-Kann, it's not a terrible thing to do -- I just wouldn't expect to see 1. d4 c6 2. e4 very often, at least from people (computers will transpose, as they of course don't have preferences the same way people do).
Well according to the chessgames.com database e4 is played almost exclusively. However, even if black does choose to play c4 or Nf3 it typically transposes into the Slav or Semi-Slav, which is his next best option anyway.

I've seen the term Queen's Gambit Refused to mean things like 1 d4 d5 2 c4 Nf6 which I think is called the Marshall Variation or Marshall Defense. I think 2 ... Nc6 is also considered a Queen's Gambit "Refused" system.

I've seen the term Queen's Gambit Refused to mean things like 1 d4 d5 2 c4 Nf6 which I think is called the Marshall Variation or Marshall Defense. I think 2 ... Nc6 is also considered a Queen's Gambit "Refused" system.
1. d4 d5 2. c4 Nc6 is the Chigorin Defence to the Queen's Gambit.
I think Queen's Gambit Declined is usually used to refer to lines with 2. ... e6 as other declined lines have other names.
I've seen the term Queen's Gambit Refused to mean things like 1 d4 d5 2 c4 Nf6 which I think is called the Marshall Variation or Marshall Defense. I think 2 ... Nc6 is also considered a Queen's Gambit "Refused" system.
1. d4 d5 2. c4 Nc6 is the Chigorin Defence to the Queen's Gambit.
I think Queen's Gambit Declined is usually used to refer to lines with 2. ... e6 as other declined lines have other names.
Yeah the term Queen's gambit declined can refer specifically to 1. d4 d5 2. c4 e6.
That is usually referred to as Queen's gambit orthodox variation. QGD can mean any move after d4 d5 c4 that doesnt accept the c4 pawn.

I think most people who open with d4 are not looking to transpose to an e4 opening (such as the Caro-Kann). Of course, if you enjoy playing the Caro-Kann, it's not a terrible thing to do -- I just wouldn't expect to see 1. d4 c6 2. e4 very often, at least from people (computers will transpose, as they of course don't have preferences the same way people do).
Well according to the chessgames.com database e4 is played almost exclusively.
No, that's not how the chess.com database works. The number it shows is the number of times the position after 1.d4 c6 2.e4 occurred, but that also includes the 1.e4 move order!
Personally I don't really see the point of 1.d4 c6, it's just giving White more options.
Hi folks. I am looking to start playing chess again (never been more than a newb) and a couple of years ago a friend started teaching me a response to 1.e4 called the Caro-Kann, which I kind of took a liking to. I'd like to also have a response to 1.d4 that I could tudy which would be similar in style to the Caro-Kann. If there is a legit opening that starts 1.d4 c6 that would be a bonus! Thanks for your comments!