diff --git a/src/cli.rs b/src/cli.rs
index 25d064d..027bc60 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -13,6 +13,7 @@ use crate::files::{self, Files};
 use self::error::Result;
 use self::layout::line::LineLayout;
 
+mod cancel;
 mod done;
 mod error;
 mod layout;
@@ -49,6 +50,12 @@ pub enum Command {
         #[structopt(required = true)]
         entries: Vec<usize>,
     },
+    /// Marks one or more entries as canceled
+    Cancel {
+        /// Entries to mark as done
+        #[structopt(required = true)]
+        entries: Vec<usize>,
+    },
     /// Reformat all loaded files
     Fmt,
 }
@@ -107,6 +114,14 @@ fn run_command(opt: &Opt, files: &mut Files, range: DateRange, now: NaiveDateTim
             let layout = find_layout(files, &entries, range, now);
             print::print(&layout);
         }
+        Some(Command::Cancel { entries: ns }) => {
+            let entries = find_entries(files, range)?;
+            let layout = find_layout(files, &entries, range, now);
+            cancel::cancel(files, &entries, &layout, ns, now)?;
+            let entries = find_entries(files, range)?;
+            let layout = find_layout(files, &entries, range, now);
+            print::print(&layout);
+        }
         Some(Command::Fmt) => files.mark_all_dirty(),
     }
     Ok(())
diff --git a/src/cli/cancel.rs b/src/cli/cancel.rs
new file mode 100644
index 0000000..62cc8ea
--- /dev/null
+++ b/src/cli/cancel.rs
@@ -0,0 +1,37 @@
+use std::vec;
+
+use chrono::NaiveDateTime;
+
+use crate::eval::Entry;
+use crate::files::commands::{Done, DoneKind};
+use crate::files::Files;
+
+use super::error::{Error, Result};
+use super::layout::line::LineLayout;
+
+pub fn cancel(
+    files: &mut Files,
+    entries: &[Entry],
+    layout: &LineLayout,
+    numbers: &[usize],
+    now: NaiveDateTime,
+) -> Result<()> {
+    let mut not_tasks = vec![];
+    for &number in numbers {
+        let entry = &entries[layout.look_up_number(number)?];
+        let done = Done {
+            kind: DoneKind::Canceled,
+            date: entry.dates.map(|dates| dates.into()),
+            done_at: now.date(),
+        };
+        if !files.add_done(entry.source, done) {
+            not_tasks.push(number);
+        }
+    }
+
+    if not_tasks.is_empty() {
+        Ok(())
+    } else {
+        Err(Error::NotATask(not_tasks))
+    }
+}
diff --git a/src/cli/done.rs b/src/cli/done.rs
index 379d6ce..1d3d809 100644
--- a/src/cli/done.rs
+++ b/src/cli/done.rs
@@ -3,7 +3,7 @@ use std::vec;
 use chrono::NaiveDateTime;
 
 use crate::eval::Entry;
-use crate::files::commands::Done;
+use crate::files::commands::{Done, DoneKind};
 use crate::files::Files;
 
 use super::error::{Error, Result};
@@ -20,6 +20,7 @@ pub fn done(
     for &number in numbers {
         let entry = &entries[layout.look_up_number(number)?];
         let done = Done {
+            kind: DoneKind::Done,
             date: entry.dates.map(|dates| dates.into()),
             done_at: now.date(),
         };
diff --git a/src/cli/layout/day.rs b/src/cli/layout/day.rs
index e326307..30db056 100644
--- a/src/cli/layout/day.rs
+++ b/src/cli/layout/day.rs
@@ -73,7 +73,9 @@ impl DayLayout {
     fn layout_entry(&mut self, index: usize, entry: &Entry) {
         match entry.kind {
             EntryKind::Task => self.layout_task(index, entry),
-            EntryKind::TaskDone(at) => self.layout_task_done(index, entry, at),
+            EntryKind::TaskDone(at) | EntryKind::TaskCanceled(at) => {
+                self.layout_task_done(index, entry, at)
+            }
             EntryKind::Note | EntryKind::Birthday(_) => self.layout_note(index, entry),
         }
     }
@@ -208,7 +210,7 @@ impl DayLayout {
         // 3.
         entries.sort_by_key(|(_, e, _)| match e.kind {
             EntryKind::Task => 0,
-            EntryKind::TaskDone(_) => 1,
+            EntryKind::TaskDone(_) | EntryKind::TaskCanceled(_) => 1,
             EntryKind::Birthday(_) => 2,
             EntryKind::Note => 3,
         });
diff --git a/src/cli/layout/line.rs b/src/cli/layout/line.rs
index e5e8412..637d963 100644
--- a/src/cli/layout/line.rs
+++ b/src/cli/layout/line.rs
@@ -60,6 +60,7 @@ pub enum Times {
 pub enum LineKind {
     Task,
     Done,
+    Canceled,
     Note,
     Birthday,
 }
@@ -245,6 +246,7 @@ impl LineLayout {
         match entry.kind {
             EntryKind::Task => LineKind::Task,
             EntryKind::TaskDone(_) => LineKind::Done,
+            EntryKind::TaskCanceled(_) => LineKind::Canceled,
             EntryKind::Note => LineKind::Note,
             EntryKind::Birthday(_) => LineKind::Birthday,
         }
diff --git a/src/cli/print.rs b/src/cli/print.rs
index 22f5108..657cf1e 100644
--- a/src/cli/print.rs
+++ b/src/cli/print.rs
@@ -134,6 +134,7 @@ impl ShowLines {
         match kind {
             LineKind::Task => "T".magenta().bold(),
             LineKind::Done => "D".green().bold(),
+            LineKind::Canceled => "C".red().bold(),
             LineKind::Note => "N".blue().bold(),
             LineKind::Birthday => "B".yellow().bold(),
         }
diff --git a/src/cli/show.rs b/src/cli/show.rs
index 1b20413..81cac22 100644
--- a/src/cli/show.rs
+++ b/src/cli/show.rs
@@ -13,6 +13,10 @@ fn show_entry(files: &Files, entry: &Entry) {
             println!("DONE {}", command.title());
             println!("DONE AT {}", when);
         }
+        EntryKind::TaskCanceled(when) => {
+            println!("CANCELED {}", command.title());
+            println!("CANCELED AT {}", when);
+        }
         EntryKind::Note => println!("NOTE {}", command.title()),
         EntryKind::Birthday(Some(age)) => {
             println!("BIRTHDAY {}", command.title());
diff --git a/src/eval/command.rs b/src/eval/command.rs
index e65e6e6..b0ec4a5 100644
--- a/src/eval/command.rs
+++ b/src/eval/command.rs
@@ -3,7 +3,7 @@ use std::collections::HashMap;
 use chrono::{Duration, NaiveDate};
 
 use crate::files::commands::{
-    self, BirthdaySpec, Command, Done, DoneDate, Note, Spec, Statement, Task,
+    self, BirthdaySpec, Command, Done, DoneDate, DoneKind, Note, Spec, Statement, Task,
 };
 use crate::files::primitives::{Span, Spanned, Time};
 use crate::files::SourcedCommand;
@@ -296,10 +296,12 @@ impl<'a> CommandState<'a> {
     }
 
     fn eval_done(&mut self, done: &Done) -> Result<()> {
-        self.add_forced(self.entry_with_remind(
-            EntryKind::TaskDone(done.done_at),
-            done.date.map(|date| date.into()),
-        )?);
+        let kind = match done.kind {
+            DoneKind::Done => EntryKind::TaskDone(done.done_at),
+            DoneKind::Canceled => EntryKind::TaskCanceled(done.done_at),
+        };
+        let dates = done.date.map(|date| date.into());
+        self.add_forced(self.entry_with_remind(kind, dates)?);
         Ok(())
     }
 }
diff --git a/src/eval/entry.rs b/src/eval/entry.rs
index 303900d..09d51a0 100644
--- a/src/eval/entry.rs
+++ b/src/eval/entry.rs
@@ -9,6 +9,7 @@ use super::range::DateRange;
 pub enum EntryKind {
     Task,
     TaskDone(NaiveDate),
+    TaskCanceled(NaiveDate),
     Note,
     Birthday(Option<i32>),
 }
@@ -120,7 +121,7 @@ impl Entries {
         }
 
         // Tasks that were finished inside the range
-        if let EntryKind::TaskDone(done) = entry.kind {
+        if let EntryKind::TaskDone(done) | EntryKind::TaskCanceled(done) = entry.kind {
             if self.range.contains(done) {
                 return true;
             }
diff --git a/src/files/commands.rs b/src/files/commands.rs
index 76166b0..7d1ec2d 100644
--- a/src/files/commands.rs
+++ b/src/files/commands.rs
@@ -309,8 +309,15 @@ impl DoneDate {
     }
 }
 
+#[derive(Debug)]
+pub enum DoneKind {
+    Done,
+    Canceled,
+}
+
 #[derive(Debug)]
 pub struct Done {
+    pub kind: DoneKind,
     pub date: Option<DoneDate>,
     pub done_at: NaiveDate,
 }
diff --git a/src/files/format.rs b/src/files/format.rs
index e169142..0694462 100644
--- a/src/files/format.rs
+++ b/src/files/format.rs
@@ -2,6 +2,8 @@ use std::fmt;
 
 use chrono::Datelike;
 
+use crate::files::commands::DoneKind;
+
 use super::commands::{
     BirthdaySpec, Command, DateSpec, Delta, DeltaStep, Done, DoneDate, Expr, File, FormulaSpec,
     Note, Repeat, Spec, Statement, Task, Var, WeekdaySpec,
@@ -258,7 +260,11 @@ impl fmt::Display for DoneDate {
 
 impl fmt::Display for Done {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "DONE [{}]", self.done_at)?;
+        let kind = match self.kind {
+            DoneKind::Done => "DONE",
+            DoneKind::Canceled => "CANCELED",
+        };
+        write!(f, "{} [{}]", kind, self.done_at)?;
         if let Some(date) = &self.date {
             write!(f, " {}", date)?;
         }
diff --git a/src/files/grammar.pest b/src/files/grammar.pest
index a2712be..24e9a51 100644
--- a/src/files/grammar.pest
+++ b/src/files/grammar.pest
@@ -118,7 +118,8 @@ donedate = {
     | datum ~ "--" ~ datum
     | datum
 }
-done = !{ "DONE" ~ "[" ~ datum ~ "]" ~ donedate? ~ eol }
+done_kind = { "DONE" | "CANCELED" }
+done = !{ done_kind ~ "[" ~ datum ~ "]" ~ donedate? ~ eol }
 dones = { done* }
 
 desc_line = { "#" ~ (" " ~ rest_any)? ~ eol }
diff --git a/src/files/parse.rs b/src/files/parse.rs
index 8a756f7..fc869e5 100644
--- a/src/files/parse.rs
+++ b/src/files/parse.rs
@@ -8,8 +8,8 @@ use pest::prec_climber::{Assoc, Operator, PrecClimber};
 use pest::{Parser, Span};
 
 use super::commands::{
-    BirthdaySpec, Command, DateSpec, Delta, DeltaStep, Done, DoneDate, Expr, File, FormulaSpec,
-    Note, Repeat, Spec, Statement, Task, Var, WeekdaySpec,
+    BirthdaySpec, Command, DateSpec, Delta, DeltaStep, Done, DoneDate, DoneKind, Expr, File,
+    FormulaSpec, Note, Repeat, Spec, Statement, Task, Var, WeekdaySpec,
 };
 use super::primitives::{Spanned, Time, Weekday};
 
@@ -704,10 +704,20 @@ fn parse_donedate(p: Pair<'_, Rule>) -> Result<DoneDate> {
     })
 }
 
+fn parse_done_kind(p: Pair<'_, Rule>) -> DoneKind {
+    assert_eq!(p.as_rule(), Rule::done_kind);
+    match p.as_str() {
+        "DONE" => DoneKind::Done,
+        "CANCELED" => DoneKind::Canceled,
+        _ => unreachable!(),
+    }
+}
+
 fn parse_done(p: Pair<'_, Rule>) -> Result<Done> {
     assert_eq!(p.as_rule(), Rule::done);
     let mut p = p.into_inner();
 
+    let kind = parse_done_kind(p.next().unwrap());
     let done_at = parse_datum(p.next().unwrap())?.value;
     let date = if let Some(p) = p.next() {
         Some(parse_donedate(p)?)
@@ -717,7 +727,11 @@ fn parse_done(p: Pair<'_, Rule>) -> Result<Done> {
 
     assert_eq!(p.next(), None);
 
-    Ok(Done { date, done_at })
+    Ok(Done {
+        kind,
+        date,
+        done_at,
+    })
 }
 
 fn parse_dones(p: Pair<'_, Rule>) -> Result<Vec<Done>> {