Does anyone know if fibroids or an ovarian cyst will cause a smear test to come back 'abnormal'?

Or should I assume that the abnormal result is something different?

No.
A smear test only looks at cells fro the cervix and vagina.
To make a diagnosis of an ovarian cyst, or a fibroid, you would need either an abdominal ultrasound scan, or a transvaginal ultrasound scan. Obviously, the other way of making a diagnosis for these two conditions would be a laparoscopy (a small surgical procedure where the doctor looks at your pelvic organs with a small telescope, inserted just below your tummy button).
If your fibroid is a reasonable size, you may be able to feel it yourself...certainly a doctor would be able to feel it on bimanual pelvic examination. If you do have a fibroid, you may get symptoms such as heavy, painful periods-but this is not an exclusive symtom, and may be a sign of something else. Shouild you be suffering from an ovarian cyst, you may get thinning of your hair, and a lot a pelvic pain, particularly if the cyst gets twisted.
Your best option would be to see your doctor, and tell him or her about all of your symtoms, and get examined.

No, ovarian conditions or fibroids wont cause an abnormal smear.
Doctor
I had one once and the reason was an ovarian cyst, I was rechecked at 6 mos tho and it was mormal. I also had an abnormal pap right after my son was born and she rechecked it 6 weeks later and it was normal. Its not always a bad thing, but it is scary. Im sure you will be fine! Good luck!!
yes it will
experince
Straight answer: no. But 'abnormal' is not necessarily a disaster depending on the degree of abnormality...............best thing is to consult your doctor. Hope everything turns out OK. Most likely it will.