我们(wǒmen)
咱们(zánmen)

The following is a list of the personal pronouns in 汉语. 

Subjective & Objective

我     我们

你/您     你们/您们

他/她/它     他们/她们/它们

Possessive

我的     我们的

你的/您的     你们的/您们的

他的/她的/它的     他们的/她们的/它们的

So far, there is nothing new. The above information can be found in just about any Chinese language textbook. Instead of simply going by the book, I'd like to deviate a little bit and touch upon another first-person plural pronoun 咱们 in comparison with 我们, which is more familiar to most Chinese learners. The difference between these two words is as follows. 

"我们" 只包括说话人, 是排除式用法, 排除听话人一方。 "咱们" 包括说话人和听话人双方, 是包括式用法。 

For example, 

我们去看电影。你呢？（我们 doesn't include 你.） 

我们去看电影吧。(我们 includes both 我/我们 and 你.） 

你饿了吧？咱们去吃饭吧。(咱们 includes both 我/我们 and 你.）