The definition of humanism is:
any system or mode of thought or action in which human interests, values, and dignity predominate.
Under this definition, the play A Doll's House definitely reunites themes that deal with the preservation of human dignity, namely, Nora's.
However, if you were to conduct a feminist analysis of A Doll's House, you would have to consider the literal definition of "feminism," which is:
the doctrine advocating social, political, and all other rights of women equal to those of men
That said, the play would lean toward feminism.
The plot of the play revolves around a female main character whose key issues are related to the fact that she is a woman. Moreover, the aspects of "social and political" equality for women are also evident in the play because Ibsen makes it clear, through the actions of Krogstad and Torvald, and through showing the social rules of the time, that women, like Nora, are treated unfairly on a regular basis. He makes it known, without taking sides, that Nora is one of thousands of women of her generation, and even prior to it, whose dignity and human rights are entirely dependent on a male-dominated society.
Added to this is Ibsen's famous quote regarding his play:
A woman cannot be herself in contemporary society, it is an exclusively male society with laws drafted by men, and with counsel and judges who judge feminine conduct from the male point of view
That statement alone encompasses the definition of feminism. Again, for these reasons, you would want to consider A Doll's House a feminist play.
Another indicator of this play being more feminist than humanist is the backlash that it received upon its first staging. The fact that the play touched the nerve of the society that it was mirroring is very telling. The shock was so enormous, it is said, that some people would make it a rule not to discuss the play even during their tea time or during any type of social gathering. The idea of Nora, "a woman," leaving her family and her household duties was so bold for its time that it was considered immoral.
A lot has been written about the effects of the play and how it was so controversial, which is indicative of the fact that thinking about women's rights during that time was unheard of. For more information, I recommend that you read Joan Templeton's article "The Doll House backlash: Criticism, Feminism, and Ibsen" (1989).