I would say definitely, in as much as male can be. Obviously he will never truly understand what it means to be female or anything, but he is definitely not one of these dinosaurs who thinks that housework is womens work and such. Infact, he does MUCH more housework than me, and probably a lot more childcare too. I mean, he has to really given my health problems, but even before I became ill he did most stuff around the house.
He also fairly regularly speaks up about sexist language. Its somewhat of a running joke among his male friends 'don't objectify women around X, he will eat you alive' and so on.
When male friends of his have started hating on feminism as 'feminists should be worried about how theres not many male DV refuges etc' and such he will point out that the reason there is so much help for women with refuges is because 1. Male violence is such an epidemic and male on female DV tends to be much more serious than female on male. 2. Females fought for these services, so should males be inclined to think demand is even slightly similar, males should get off their arse and help other males.
He also totally gets the whole trans bollocks, and how it is anti-women. I genuinely believe this trans stuff to be the biggest threat to womens rights that there has been in a fairly long time, so having him understand without me having to drill it into him has been somewhat refreshing.
So yeah, I would say he is as much a feminist as a male can be. And I am so thankful for that.