diff --git a/src/bin/ent/main.rs b/src/bin/ent/main.rs
index e09b1a9..d67ef3c 100644
--- a/src/bin/ent/main.rs
+++ b/src/bin/ent/main.rs
@@ -34,6 +34,10 @@ enum Commands {
         /// "assignee": Comma-separated list of assignees to list.
         /// Defaults to all assignees if not set.
         ///
+        /// "tag": Comma-separated list of tags to include or exclude
+        /// (if prefixed with "-").  If omitted, defaults to including
+        /// all tags and excluding none.
+        ///
         #[arg(default_value_t = String::from("state=New,Backlog,Blocked,InProgress"))]
         filter: String,
     },
@@ -187,6 +191,17 @@ fn handle_command(
                     }
                 }
 
+                if filter.include_tags.len() > 0 {
+                    if !issue.has_any_tag(&filter.include_tags) {
+                        continue;
+                    }
+                }
+                if filter.exclude_tags.len() > 0 {
+                    if issue.has_any_tag(&filter.exclude_tags) {
+                        continue;
+                    }
+                }
+
                 // This issue passed all the filters, include it in list.
                 uuids_by_state
                     .entry(issue.state.clone())
diff --git a/src/issue.rs b/src/issue.rs
index 8cdbd4f..bd0632c 100644
--- a/src/issue.rs
+++ b/src/issue.rs
@@ -347,6 +347,20 @@ impl Issue {
         ))?;
         Ok(())
     }
+
+    pub fn has_tag(&self, tag: &str) -> bool {
+        let tag_string = String::from(tag);
+        self.tags.iter().position(|x| x == &tag_string).is_some()
+    }
+
+    pub fn has_any_tag(&self, tags: &std::collections::HashSet<&str>) -> bool {
+        for tag in tags.iter() {
+            if self.has_tag(tag) {
+                return true;
+            }
+        }
+        return false;
+    }
 }
 
 // This is the internal/private API of Issue.
diff --git a/src/lib.rs b/src/lib.rs
index b28fb74..fa820b4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,6 +20,8 @@ pub enum ParseFilterError {
 pub struct Filter<'a> {
     pub include_states: std::collections::HashSet<crate::issue::State>,
     pub include_assignees: std::collections::HashSet<&'a str>,
+    pub include_tags: std::collections::HashSet<&'a str>,
+    pub exclude_tags: std::collections::HashSet<&'a str>,
 }
 
 impl<'a> Filter<'a> {
@@ -33,6 +35,8 @@ impl<'a> Filter<'a> {
                 State::New,
             ]),
             include_assignees: std::collections::HashSet::<&'a str>::new(),
+            include_tags: std::collections::HashSet::<&'a str>::new(),
+            exclude_tags: std::collections::HashSet::<&'a str>::new(),
         };
 
         for filter_chunk_str in filter_str.split(":") {
@@ -48,12 +52,29 @@ impl<'a> Filter<'a> {
                         f.include_states.insert(crate::issue::State::from_str(s)?);
                     }
                 }
+
                 "assignee" => {
                     f.include_assignees.clear();
                     for s in tokens[1].split(",") {
                         f.include_assignees.insert(s);
                     }
                 }
+
+                "tag" => {
+                    f.include_tags.clear();
+                    f.exclude_tags.clear();
+                    for s in tokens[1].split(",") {
+                        if s.len() == 0 {
+                            return Err(ParseFilterError::ParseError);
+                        }
+                        if s.chars().nth(0).unwrap() == '-' {
+                            f.exclude_tags.insert(&s[1..]);
+                        } else {
+                            f.include_tags.insert(s);
+                        }
+                    }
+                }
+
                 _ => {
                     println!("unknown filter chunk '{}'", filter_chunk_str);
                     return Err(ParseFilterError::ParseError);