Are there any unicorns/dwarves in Skyrim?

Dwarves (or Dwemer) in Skyrim have been "extinct" for a long time, the only remains of them are their ruins and automatons. http://www.uesp.net/wiki/Lore:Dwemer

I'm not sure about Unicorns, but I haven't seen any yet.

And there is nothing on the wiki: http://www.uesp.net/wiki/Lore:Unicorn#Unicorn

As far as the Dwarfs (or Dwemer) are concerned: they are an extinct species of elf, whose names mostly end in -mer:

• Aldmer (a.k.a. Elder Folk)
• Altmer (a.k.a. High Elves)
• Ayleid (a.k.a. Wild Elves, Heartland High Elves)
• Bosmer (a.k.a. Wood Elves)
• Chimer (a.k.a. Changed Folk)
• Dunmer (a.k.a. Dark Elves)
• Dwemer (a.k.a. Dwarves, or Deep Folk)
• Falmer (a.k.a. Snow Elves)
• Maormer (a.k.a. Sea Elves or Tropical Elves)
• Orc (a.k.a. Orsimer, or Pariah Folk)

(List lifted directly from the UESP page on Races)

Please note that as direct descendants of the Aldmeri-Nedic Manmer, Bretons are sometimes known by that name: Manmer.

The only thing left of the Dwemer as far as I know are the ruins of their cities and some of their mechanical creations.

I don't believe there is a unicorn in Skyrim.

According to the UESP unicorns were present in Oblivion only and can't be found in Skyrim. To the best of my knowledge there has only been one living dwarf present in any of the Elder Scrolls games and that was Yagrum Bagarn in Morrowind.