New York allows both no-fault and fault-based divorces. The most common no-fault ground is the "irretrievable breakdown" of the marriage for at least six months. Other fault grounds include adultery, cruelty, abandonment, and imprisonment. You begin by filing a "Summons with Notice" or "Summons and Complaint" in the Supreme Court of your county. This document outlines your grounds for divorce. After filing, you must serve your spouse with a copy of the petition.