Police are seeking public help to find an 18-month-old girl who is thought to be with her father in the Logan region, south of Brisbane.

Police said the pair may have travelled interstate. ( Supplied: Australian Federal Police )

The Australian Federal Police said Aubree Leigh Best was with her 33-year-old father, Jordan Leigh Best.

The AFP said Jordan does have family in South Australia and may have travelled.

Anyone with information should contact Crime Stoppers on 1800 333 000.