diff --git a/internal/tmpl/tmpl.go b/internal/tmpl/tmpl.go
index 624b526fe..72472302c 100644
--- a/internal/tmpl/tmpl.go
+++ b/internal/tmpl/tmpl.go
@@ -230,6 +230,7 @@ func (t *Template) Apply(s string) (string, error) {
 			"reverseFilter":  filter(true),
 			"mdv2escape":     mdv2Escape,
 			"envOrDefault":   t.envOrDefault,
+			"isEnvSet":       t.isEnvSet,
 			"map":            makemap,
 			"indexOrDefault": indexOrDefault,
 		}).
@@ -256,6 +257,11 @@ func (t *Template) ApplyAll(sps ...*string) error {
 	return nil
 }
 
+func (t *Template) isEnvSet(name string) bool {
+	s, ok := t.fields[env].(context.Env)[name]
+	return ok && s != ""
+}
+
 func (t *Template) envOrDefault(name, value string) string {
 	s, ok := t.fields[env].(context.Env)[name]
 	if !ok {
diff --git a/internal/tmpl/tmpl_test.go b/internal/tmpl/tmpl_test.go
index e1daa59a0..14171215d 100644
--- a/internal/tmpl/tmpl_test.go
+++ b/internal/tmpl/tmpl_test.go
@@ -96,6 +96,7 @@ func TestWithArtifact(t *testing.T) {
 		"state dirty":                      `state {{.GitTreeState}}`,
 		"env bar: barrrrr":                 `env bar: {{ envOrDefault "BAR" "barrrrr" }}`,
 		"env foo: bar":                     `env foo: {{ envOrDefault "FOO" "barrrrr" }}`,
+		"env foo is set: true":             `env foo is set: {{ isEnvSet "FOO" }}`,
 
 		"remove this": "{{ filter .Env.MULTILINE \".*remove.*\" }}",
 		"something with\nmultiple lines\nto test things": "{{ reverseFilter .Env.MULTILINE \".*remove.*\" }}",
diff --git a/www/docs/customization/templates.md b/www/docs/customization/templates.md
index eb7955ffe..fa86f16cf 100644
--- a/www/docs/customization/templates.md
+++ b/www/docs/customization/templates.md
@@ -160,6 +160,7 @@ On all fields, you have these available functions:
 | `title "foo"`                     | "titlenize" the string using english as language. See [Title](https://pkg.go.dev/golang.org/x/text/cases#Title). Since v1.14    |
 | `mdv2escape "foo"`                | escape characters according to MarkdownV2, especially useful in the Telegram integration. Since v1.19                           |
 | `envOrDefault "NAME" "value"`     | either gets the value of the given environment variable, or the given default. Since v1.19                                      |
+| `isEnvSet "NAME"`                 | returns true if the env is set and not empty, false otherwise. Since v1.26                                                      |
 | `$m := map "KEY" "VALUE"`         | creates a map from a list of key and value pairs. Both keys and values must be of type `string`. Since v1.21                    |
 | `indexOrDefault $m "KEY" "value"` | either gets the value of the given key or the given default value from the given map. Since v1.21                               |