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Yes, when you add some attribution below it:
please add:
https://steemit.com/steemit/@rmp/3d-steem-logo-with-white-background
or
https://steemit.com/@rmp
or
when you use it at steemit.com at least @rmp

But don't use it as avatar pic!

I just used your Steemit logo at the bottom of my latest post (with a link to this post and attribution to @rmp) - check it out in action :) https://steemit.com/science/@carlgnash/deep-dreaming-about-global-warming