Look up guardrail in Wiktionary, the free dictionary.
A guard rail is a protective boundary feature.
Guard rail or guardrail may also refer to:
- Railroad guard rails (otherwise known as check rails), installed parallel to trackbed rails, for railway safety
- RC-12 Guardrail, a U.S. Army intelligence-gathering aircraft based on the C-12 Huron
- Roof edge protection, rails installed on roofs to protect construction and roofing workers
- Traffic barrier, installed on roadways for automobile safety