---
type: "fhirpath-operator"
title: "FHIRPath Operator: or (or)"
operator: "or"
category: "Boolean Logic"
section: "6.5.2"
source: "fhirpath/operations.json"
---
# FHIRPath Operator: or (or)
Returns `false` if both operands evaluate to `false`, `true` if either operand evaluates to `true`, and empty (`{ }`) otherwise:

|or |true |false |empty |
| - | - | - | - |
|**true** |`true` |`true` |`true` |
|**false** |`true` |`false` |empty (`{ }`) |
|**empty** |`true` |empty (`{ }`) |empty (`{ }`) |
{:.grid}
## Summary
- **Category**: Boolean Logic
- **Section**: `6.5.2`
- **Left Argument**: `Boolean`
- **Right Argument**: `Boolean`
- **Return Type**: `Boolean`
- **Empty Input Result**: `empty`
- **Errors on Multiple Input**: `false`
## Description
Returns `false` if both operands evaluate to `false`, `true` if either operand evaluates to `true`, and empty collection otherwise. Uses three-valued logic to propagate empty operands.
## Type Mapping
- `Boolean-Boolean`