diff --git a/Cargo.lock b/Cargo.lock
index cc7c3967b..b2a545e20 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -50,6 +50,12 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -123,10 +129,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "afa748e348ad3be8263be728124b24a24f268266f6f5d58af9d75f6a40b5c587"
 dependencies = [
  "arrayref",
- "arrayvec",
+ "arrayvec 0.5.2",
  "constant_time_eq",
 ]
 
+[[package]]
+name = "blake3"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a08e53fc5a564bb15bfe6fae56bd71522205f1f91893f9c0116edad6496c183f"
+dependencies = [
+ "arrayref",
+ "arrayvec 0.7.2",
+ "cc",
+ "cfg-if 1.0.0",
+ "constant_time_eq",
+ "digest",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.10.0"
@@ -670,6 +690,7 @@ dependencies = [
  "block-buffer",
  "crypto-common",
  "generic-array",
+ "subtle",
 ]
 
 [[package]]
@@ -1850,6 +1871,12 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "subtle"
+version = "2.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
+
 [[package]]
 name = "syn"
 version = "1.0.86"
@@ -2375,6 +2402,7 @@ name = "uu_hashsum"
 version = "0.0.12"
 dependencies = [
  "blake2b_simd",
+ "blake3",
  "clap 3.0.10",
  "digest",
  "hex",
diff --git a/src/uu/hashsum/Cargo.toml b/src/uu/hashsum/Cargo.toml
index 6032a9428..495e15972 100644
--- a/src/uu/hashsum/Cargo.toml
+++ b/src/uu/hashsum/Cargo.toml
@@ -27,6 +27,7 @@ sha1 = "0.6.0"
 sha2 = "0.10.1"
 sha3 = "0.10.0"
 blake2b_simd = "0.5.11"
+blake3 = "1.3.1"
 uucore = { version=">=0.0.11", package="uucore", path="../../uucore" }
 
 [[bin]]
diff --git a/src/uu/hashsum/src/digest.rs b/src/uu/hashsum/src/digest.rs
index 23fe84e77..c06834c74 100644
--- a/src/uu/hashsum/src/digest.rs
+++ b/src/uu/hashsum/src/digest.rs
@@ -81,6 +81,29 @@ impl Digest for blake2b_simd::State {
     }
 }
 
+impl Digest for blake3::Hasher {
+    fn new() -> Self {
+        Self::new()
+    }
+
+    fn input(&mut self, input: &[u8]) {
+        self.update(input);
+    }
+
+    fn result(&mut self, out: &mut [u8]) {
+        let hash_result = &self.finalize();
+        out.copy_from_slice(hash_result.as_bytes());
+    }
+
+    fn reset(&mut self) {
+        *self = Self::new();
+    }
+
+    fn output_bits(&self) -> usize {
+        256
+    }
+}
+
 impl Digest for sha1::Sha1 {
     fn new() -> Self {
         Self::new()
diff --git a/src/uu/hashsum/src/hashsum.rs b/src/uu/hashsum/src/hashsum.rs
index 30c9d5b92..fe607b554 100644
--- a/src/uu/hashsum/src/hashsum.rs
+++ b/src/uu/hashsum/src/hashsum.rs
@@ -70,6 +70,7 @@ fn is_custom_binary(program: &str) -> bool {
             | "shake128sum"
             | "shake256sum"
             | "b2sum"
+            | "b3sum"
     )
 }
 
@@ -93,6 +94,11 @@ fn detect_algo(
             Box::new(blake2b_simd::State::new()) as Box<dyn Digest>,
             512,
         ),
+        "b3sum" => (
+            "BLAKE3",
+            Box::new(blake3::Hasher::new()) as Box<dyn Digest>,
+            256,
+        ),
         "sha3sum" => match matches.value_of("bits") {
             Some(bits_str) => match (bits_str).parse::<usize>() {
                 Ok(224) => (
@@ -196,6 +202,9 @@ fn detect_algo(
                 if matches.is_present("b2sum") {
                     set_or_crash("BLAKE2", Box::new(blake2b_simd::State::new()), 512);
                 }
+                if matches.is_present("b3sum") {
+                    set_or_crash("BLAKE3", Box::new(blake3::Hasher::new()), 256);
+                }
                 if matches.is_present("sha3") {
                     match matches.value_of("bits") {
                         Some(bits_str) => match (bits_str).parse::<usize>() {
@@ -433,6 +442,7 @@ pub fn uu_app_custom<'a>() -> App<'a> {
             "work with SHAKE256 using BITS for the output size",
         ),
         ("b2sum", "work with BLAKE2"),
+        ("b3sum", "work with BLAKE3"),
     ];
 
     for (name, desc) in algorithms {
diff --git a/tests/by-util/test_hashsum.rs b/tests/by-util/test_hashsum.rs
index 545b4ee78..293270a77 100644
--- a/tests/by-util/test_hashsum.rs
+++ b/tests/by-util/test_hashsum.rs
@@ -80,4 +80,5 @@ test_digest! {
     shake128_256 shake128 256
     shake256_512 shake256 512
     b2sum b2sum 512
+    b3sum b3sum 256
 }
diff --git a/tests/fixtures/hashsum/b3sum.checkfile b/tests/fixtures/hashsum/b3sum.checkfile
new file mode 100644
index 000000000..64a9bf7a4
--- /dev/null
+++ b/tests/fixtures/hashsum/b3sum.checkfile
@@ -0,0 +1 @@
+a1a55887535397bf461902491c8779188a5dd1f8c3951b3d9cf6ecba194e87b0 input.txt
\ No newline at end of file
diff --git a/tests/fixtures/hashsum/b3sum.expected b/tests/fixtures/hashsum/b3sum.expected
new file mode 100644
index 000000000..a56e54432
--- /dev/null
+++ b/tests/fixtures/hashsum/b3sum.expected
@@ -0,0 +1 @@
+a1a55887535397bf461902491c8779188a5dd1f8c3951b3d9cf6ecba194e87b0
\ No newline at end of file