Yes. In a 12 months period, I was diagnosed with both ADHD and ASD (autism spectrum disorder).
I was seeing a specialist doctor to discuss ADHD symptoms. He diagnosed me with ADHD. To my surprise, he then said he was "pretty sure" I was on the autism spectrum. He referred to for an ASD assessment, where I was subsequently diagnosed.
Here in the UK, the National Health Service produced a report on ADHD / ASD comorbidity.
http://www.rcpsych.ac.uk/pdf/Whitwell%2 ... pdates.pdf
Pages 13-15 of the report are interesting - showing where the symptoms can overlap.
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On the autism spectrum and have ADHD.