Can STDs cause infertility?

Chlamidia can.
And what's worse ,it is sometimes symptom free, so you can have it,not know and pass it on.
Good argument for barrier method contraception huh?
M

Chylmadia can b/c if not treated it can lead to PID. This can scar the fallopian tubes.

Yes , it depends on the type of infection, the causative agents and the type of complicatios .
yes of course because it causes PID

Although there are several types of pelvic disorders that may cause infertility, Pelvic Inflammatory Disease (PID) is the only one that will be discussed here. PID is one of the leading causes of infertility in women. PID starts as a sexually transmitted disease (STD). Usually gonorrhea and chlamydia are involved. If not properly treated, the infection will eventually spread from the cervix into the fallopian tubes. This may take weeks or months.
Yes, many of them can.
Pelvic Inflammatory Disease,
Human Papiloma Virus - can also cause cancer
and I'm sure many others of them as well.
YES OF COURSE they can.