Can you claim head of household if you don't claim any dependents?

No. To qualify as a head of household, a taxpayer must be unmarried at the end of the tax year, must not be a surviving spouse, must pay at least half the costs of maintaining a home, and must share that home with one or more qualifying (that is qualified as dependent) individuals for at least half the year, unless the qualifying individual is a parent of the taxpayer whom the taxpayer can claim as a dependent. For tax years beginning after December 31, 2004, the requirements for a qualifying individual are somewhat affected by changes in the definition of a dependent. However, the taxpayer will still be eligible for head-of-household status even if no dependency exemption is available for a child because the taxpayer waived the exemption or because of the existence of a pre-1985 divorce decree or separation agreement