Can I find out if my husband claimed me on his taxes?

What is the name of your state? New York
How can I find out if my husband (legally married) but estranged, filed taxes in my name. Or if he claimed me as a dependent? Is there any way to find this out? We are not legally separated, but have not lived together for years. He used to claim me and split the return, but now he claims that he doesn't claim me anymore. I don't believe him.

If there is no separation agreement then the IRS considers you married and you can file either jointly (which may be what your husband did) or as married filing separately (MFS). There is one exception to this rule, however. If you lived apart from each other the last six months of the year and one of you had a dependent child who lived with you for the entire year, then that person is considered unmarried and can file as head of household (HOH). In that case the other person would still have to file as MFS. Publication 501 explaind this fully.

You're husband cannot claim you as a dependent and if he filed jointly, then your signature is required on the form. Assuming you have not filed for tax year 2001, then one option you have is to file (MFS or HOH), and if you're husband did file jointly or claimed you as a dependent, the IRS will issue correspondence to both of you, requesting that one of you file an amended return.