Not in the same sense that it is occurring on Earth.
"Thus inferring global warming from a 3 Martian year regional trend is unwarranted. The observed regional changes in south polar ice cover are almost certainly due to a regional climate transition, not a global phenomenon, and are demonstrably unrelated to external forcing. There is a slight irony in people rushing to claim that the glacier changes on Mars are a sure sign of global warming, while not being swayed by the much more persuasive analogous phenomena here on Earth..."
LOL!!! They claim that the warming on Mars has been for three years so doesn't count. The point is that planets go through cycles of warming/cooling WITHOUT human influence. That the writer agrees that Mars has been warming for the past three years makes my point.