Nope, just the biggest one (Holocaust), the second biggest being Holodomor, an Stalin's attack to Ukranian Nationalism. Genocides in Nigeria and similar ones are ethnic ones for political power, without justification over biological differences.
No, I would argue the holocaust and more are confusing cultural disagreements with racial stereotyping which have more to do with (surprise!) culture than race. I think it's much more believable that a large group of people grew angry with a culture of racial inclusion in financial matters leading toward the ease of hatred of a racial stereotype than the actual genes involved. Race is the identifier, not the cause.
If it wasn't race, it would family names or family colors/flags, gender, buck-teeth or what-have-you, as shown throughout history. Bickering and bigotry aren't reason for arbitrarily changing things.