A saw filer or saw doctor is a person who maintains and repairs saws in a saw mill. A saw filer's work area in the mill is called the filing room.

Saws used in timber mills are very large and expensive. They need careful maintenance for safe operation. Repair of damaged saws requires a high degree of skill. It takes many years of full time saw filing to become proficient in the trade.
Bandsaws in timber mills range in size from about (4" x 22ga x 10') to (16" x 11ga x 62') and can use any of the three main different saw band types:

• Single-cut saws have, as the name implies, teeth on one side, allowing for cutting in one direction only.
• Double-cut saws have teeth on both sides.