毛泽东的英文是“Maotsetong”还是“Maozedong”

It doesn't matter.
But using Maotsetong is easy to let foreigner know who he was.
Most time, we call him Mao.

都正确。还一个是 Mao Tse-tung

但是为了发音，国外一般都写Maotsetong。国内一般都写Maozedong。

比如，清华-qinghua和Tsinghua，北京-beijing和Peking都可以。

但是要注意一些人和地方有固定的英文名，不可以用拼音。比如张振宁，Jack Zhang，内蒙古是Mongolia，直接用拼音就不行。

哇,你成功了,恭喜你啊.

Maotsetong