diff --git a/Cargo.lock b/Cargo.lock
index 242226a3f..a28c708e6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -624,6 +624,12 @@ dependencies = [
  "vsimd",
 ]
 
+[[package]]
+name = "base64ct"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -1934,6 +1940,7 @@ dependencies = [
  "aws-config",
  "aws-credential-types",
  "aws-sdk-s3",
+ "base64ct",
  "built",
  "bytes",
  "clap 3.2.25",
diff --git a/mountpoint-s3-client/Cargo.toml b/mountpoint-s3-client/Cargo.toml
index 8de524e8a..25bb0738c 100644
--- a/mountpoint-s3-client/Cargo.toml
+++ b/mountpoint-s3-client/Cargo.toml
@@ -38,6 +38,7 @@ anyhow = { version = "1.0.64", features = ["backtrace"] }
 aws-config = "0.54.1"
 aws-credential-types = "0.54.1"
 aws-sdk-s3 = "0.24.0"
+base64ct = { version = "1.6.0", features = ["std"] }
 bytes = "1.2.1"
 clap = "3.2.12"
 ctor = "0.1.23"
diff --git a/mountpoint-s3-client/src/object_client.rs b/mountpoint-s3-client/src/object_client.rs
index 9fe573f0c..8ef697c92 100644
--- a/mountpoint-s3-client/src/object_client.rs
+++ b/mountpoint-s3-client/src/object_client.rs
@@ -247,7 +247,23 @@ pub enum GetObjectAttributesError {
 /// TODO: Populate this struct with parameters from the S3 API, e.g., storage class, encryption.
 #[derive(Debug, Default, Clone)]
 #[non_exhaustive]
-pub struct PutObjectParams {}
+pub struct PutObjectParams {
+    /// Enable Crc32c trailing checksums.
+    pub trailing_checksums: bool,
+}
+
+impl PutObjectParams {
+    /// Create a default [PutObjectParams].
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// Set Crc32c trailing checksums.
+    pub fn trailing_checksums(mut self, value: bool) -> Self {
+        self.trailing_checksums = value;
+        self
+    }
+}
 
 /// A streaming put request which allows callers to asynchronously write
 /// the body of the request.
diff --git a/mountpoint-s3-client/src/s3_crt_client.rs b/mountpoint-s3-client/src/s3_crt_client.rs
index b5a100f82..980022c8d 100644
--- a/mountpoint-s3-client/src/s3_crt_client.rs
+++ b/mountpoint-s3-client/src/s3_crt_client.rs
@@ -20,8 +20,8 @@ use mountpoint_s3_crt::io::event_loop::EventLoopGroup;
 use mountpoint_s3_crt::io::host_resolver::{HostResolver, HostResolverDefaultOptions};
 use mountpoint_s3_crt::io::retry_strategy::{ExponentialBackoffJitterMode, RetryStrategy, StandardRetryOptions};
 use mountpoint_s3_crt::s3::client::{
-    init_default_signing_config, Client, ClientConfig, MetaRequestOptions, MetaRequestResult, MetaRequestType,
-    RequestType,
+    init_default_signing_config, ChecksumConfig, Client, ClientConfig, MetaRequestOptions, MetaRequestResult,
+    MetaRequestType, RequestType,
 };
 
 use async_trait::async_trait;
@@ -246,6 +246,7 @@ impl S3CrtClientInner {
             inner: message,
             uri,
             path_prefix,
+            checksum_config: None,
         })
     }
 
@@ -273,6 +274,9 @@ impl S3CrtClientInner {
         let first_body_part_clone = Arc::clone(&first_body_part);
 
         let mut options = MetaRequestOptions::new();
+        if let Some(checksum_config) = message.checksum_config {
+            options.checksum_config(checksum_config);
+        }
         options
             .message(message.inner)
             .endpoint(message.uri)
@@ -457,6 +461,7 @@ struct S3Message {
     inner: Message,
     uri: Uri,
     path_prefix: String,
+    checksum_config: Option<ChecksumConfig>,
 }
 
 impl S3Message {
@@ -528,6 +533,11 @@ impl S3Message {
     fn set_body_stream(&mut self, input_stream: Option<AsyncInputStream>) -> Option<AsyncInputStream> {
         self.inner.set_body_stream(input_stream)
     }
+
+    /// Sets the checksum configuration for this message.
+    fn set_checksum_config(&mut self, checksum_config: Option<ChecksumConfig>) {
+        self.checksum_config = checksum_config;
+    }
 }
 
 #[derive(Debug)]
diff --git a/mountpoint-s3-client/src/s3_crt_client/put_object.rs b/mountpoint-s3-client/src/s3_crt_client/put_object.rs
index bae12f7ee..951788cb9 100644
--- a/mountpoint-s3-client/src/s3_crt_client/put_object.rs
+++ b/mountpoint-s3-client/src/s3_crt_client/put_object.rs
@@ -5,7 +5,7 @@ use crate::{ObjectClientError, PutObjectRequest, PutObjectResult, S3CrtClient, S
 use async_trait::async_trait;
 use mountpoint_s3_crt::http::request_response::Header;
 use mountpoint_s3_crt::io::async_stream::{self, AsyncStreamWriter};
-use mountpoint_s3_crt::s3::client::MetaRequestType;
+use mountpoint_s3_crt::s3::client::{ChecksumConfig, MetaRequestType};
 use tracing::{debug, Span};
 
 use super::{S3CrtClientInner, S3HttpRequest};
@@ -67,6 +67,11 @@ impl S3PutObjectRequest {
             .set_request_path(&key)
             .map_err(S3RequestError::construction_failure)?;
 
+        if self.params.trailing_checksums {
+            let checksum_config = ChecksumConfig::trailing_crc32c();
+            message.set_checksum_config(Some(checksum_config));
+        }
+
         let (body_async_stream, writer) = async_stream::new_stream(&self.client.allocator);
         message.set_body_stream(Some(body_async_stream));
 
diff --git a/mountpoint-s3-client/tests/put_object.rs b/mountpoint-s3-client/tests/put_object.rs
index 99a514b1d..56460f73b 100644
--- a/mountpoint-s3-client/tests/put_object.rs
+++ b/mountpoint-s3-client/tests/put_object.rs
@@ -2,12 +2,18 @@
 
 pub mod common;
 
+use base64ct::Base64;
+use base64ct::Encoding;
 use common::*;
 use futures::{pin_mut, StreamExt};
 use mountpoint_s3_client::GetObjectError;
 use mountpoint_s3_client::ObjectClient;
 use mountpoint_s3_client::ObjectClientResult;
+use mountpoint_s3_client::PutObjectParams;
 use mountpoint_s3_client::PutObjectRequest;
+use mountpoint_s3_client::S3ClientConfig;
+use mountpoint_s3_client::S3CrtClient;
+use mountpoint_s3_crt::checksums::crc32c;
 use rand::Rng;
 
 // Simple test for PUT object. Puts a single, small object as a single part and checks that the
@@ -184,3 +190,48 @@ async fn test_put_object_abort() {
     let uploads_in_progress = get_mpu_count_for_key(&sdk_client, &bucket, &key).await.unwrap();
     assert_eq!(uploads_in_progress, 0);
 }
+
+#[tokio::test]
+async fn test_put_checksums() {
+    const PART_SIZE: usize = 5 * 1024 * 1024;
+    let (bucket, prefix) = get_test_bucket_and_prefix("test_put_checksums");
+    let client_config = S3ClientConfig {
+        throughput_target_gbps: Some(10.0),
+        part_size: Some(PART_SIZE),
+        ..Default::default()
+    };
+    let client = S3CrtClient::new(&get_test_region(), client_config).expect("could not create test client");
+    let key = format!("{prefix}hello");
+
+    let mut rng = rand::thread_rng();
+    let mut contents = vec![0u8; PART_SIZE * 2];
+    rng.fill(&mut contents[..]);
+
+    let params = PutObjectParams::new().trailing_checksums(true);
+    let mut request = client
+        .put_object(&bucket, &key, &params)
+        .await
+        .expect("put_object should succeed");
+
+    request.write(&contents).await.unwrap();
+    request.complete().await.unwrap();
+
+    let sdk_client = get_test_sdk_client().await;
+    let attributes = sdk_client
+        .get_object_attributes()
+        .bucket(bucket)
+        .key(key)
+        .object_attributes(aws_sdk_s3::model::ObjectAttributes::ObjectParts)
+        .send()
+        .await
+        .unwrap();
+    let parts = attributes.object_parts().unwrap().parts().unwrap();
+    let checksums: Vec<_> = parts.iter().map(|p| p.checksum_crc32_c().unwrap()).collect();
+    let expected_checksums: Vec<_> = contents.chunks(PART_SIZE).map(crc32c::checksum).collect();
+
+    assert_eq!(checksums.len(), expected_checksums.len());
+    for (checksum, expected_checksum) in checksums.into_iter().zip(expected_checksums.into_iter()) {
+        let encoded = Base64::encode_string(&expected_checksum.value().to_be_bytes());
+        assert_eq!(checksum, encoded);
+    }
+}
diff --git a/mountpoint-s3-crt/src/checksums/crc32.rs b/mountpoint-s3-crt/src/checksums/crc32.rs
index 55aff5074..119abf7d1 100644
--- a/mountpoint-s3-crt/src/checksums/crc32.rs
+++ b/mountpoint-s3-crt/src/checksums/crc32.rs
@@ -9,6 +9,11 @@ impl Crc32 {
     pub fn new(value: u32) -> Crc32 {
         Crc32(value)
     }
+
+    /// The CRC32 checksum value.
+    pub fn value(&self) -> u32 {
+        self.0
+    }
 }
 
 /// Computes the CRC32 checksum of a byte slice.
diff --git a/mountpoint-s3-crt/src/checksums/crc32c.rs b/mountpoint-s3-crt/src/checksums/crc32c.rs
index f0e17706d..f9630f625 100644
--- a/mountpoint-s3-crt/src/checksums/crc32c.rs
+++ b/mountpoint-s3-crt/src/checksums/crc32c.rs
@@ -9,6 +9,11 @@ impl Crc32c {
     pub fn new(value: u32) -> Crc32c {
         Crc32c(value)
     }
+
+    /// The CRC32C checksum value.
+    pub fn value(&self) -> u32 {
+        self.0
+    }
 }
 
 /// Computes the CRC32C checksum of a byte slice.
diff --git a/mountpoint-s3-crt/src/s3/client.rs b/mountpoint-s3-crt/src/s3/client.rs
index 95e7722b1..d0c5758d7 100644
--- a/mountpoint-s3-crt/src/s3/client.rs
+++ b/mountpoint-s3-crt/src/s3/client.rs
@@ -136,6 +136,9 @@ struct MetaRequestOptionsInner {
     /// Owned signing config, if provided.
     signing_config: Option<SigningConfig>,
 
+    /// Owned checksum config, if provided.
+    checksum_config: Option<ChecksumConfig>,
+
     /// Telemetry callback, if provided
     on_telemetry: Option<TelemetryCallback>,
 
@@ -210,6 +213,7 @@ impl MetaRequestOptions {
             message: None,
             endpoint: None,
             signing_config: None,
+            checksum_config: None,
             on_telemetry: None,
             on_headers: None,
             on_body: None,
@@ -255,6 +259,16 @@ impl MetaRequestOptions {
         self
     }
 
+    /// Set the checksum config used for this message.
+    pub fn checksum_config(&mut self, checksum_config: ChecksumConfig) -> &mut Self {
+        // SAFETY: we aren't moving out of the struct.
+        let options = unsafe { Pin::get_unchecked_mut(Pin::as_mut(&mut self.0)) };
+        options.checksum_config = Some(checksum_config);
+        options.inner.checksum_config =
+            options.checksum_config.as_mut().unwrap().to_inner_ptr() as *mut aws_s3_checksum_config;
+        self
+    }
+
     /// Set the signing config used for this message. Not public because we copy it from the client
     /// when making a request.
     fn signing_config(&mut self, signing_config: SigningConfig) -> &mut Self {
@@ -829,3 +843,28 @@ pub fn init_default_signing_config(region: &str, credentials_provider: Credentia
 
     SigningConfig(Arc::new(Box::into_pin(signing_config)))
 }
+
+/// The checksum configuration.
+#[derive(Debug, Clone, Default)]
+pub struct ChecksumConfig {
+    /// The struct we can pass into the CRT's functions.
+    inner: aws_s3_checksum_config,
+}
+
+impl ChecksumConfig {
+    /// Create a [ChecksumConfig] enabling Crc32c trailing checksums in PUT requests.
+    pub fn trailing_crc32c() -> Self {
+        Self {
+            inner: aws_s3_checksum_config {
+                location: aws_s3_checksum_location::AWS_SCL_TRAILER,
+                checksum_algorithm: aws_s3_checksum_algorithm::AWS_SCA_CRC32C,
+                ..Default::default()
+            },
+        }
+    }
+
+    /// Get out the inner pointer to the checksum config
+    pub(crate) fn to_inner_ptr(&self) -> *const aws_s3_checksum_config {
+        &self.inner
+    }
+}
diff --git a/mountpoint-s3/src/upload.rs b/mountpoint-s3/src/upload.rs
index 57c70565b..bff612bab 100644
--- a/mountpoint-s3/src/upload.rs
+++ b/mountpoint-s3/src/upload.rs
@@ -68,10 +68,8 @@ where
         bucket: &str,
         key: &str,
     ) -> ObjectClientResult<Self, PutObjectError, Client::ClientError> {
-        let request = inner
-            .client
-            .put_object(bucket, key, &PutObjectParams::default())
-            .await?;
+        let params = PutObjectParams::new().trailing_checksums(true);
+        let request = inner.client.put_object(bucket, key, &params).await?;
 
         Ok(Self {
             bucket: bucket.to_owned(),