diff --git a/bindings/go/osvdev/osvdev.go b/bindings/go/osvdev/osvdev.go
index e67434b4076..d516e5d8df5 100644
--- a/bindings/go/osvdev/osvdev.go
+++ b/bindings/go/osvdev/osvdev.go
@@ -27,9 +27,15 @@ const (
 	// DetermineVersionEndpoint is the URL for posting determineversion queries to OSV.
 	DetermineVersionEndpoint = "/v1experimental/determineversion"
 
+	// UbuntuBinaryToSourceEndpoint is the URL for posting Ubuntu binary-to-source package mapping queries to OSV.
+	UbuntuBinaryToSourceEndpoint = "/v1experimental/ubuntu/binary-to-source"
+
 	// MaxQueriesPerQueryBatchRequest is a limit set in osv.dev's API, so is not configurable
 	MaxQueriesPerQueryBatchRequest = 1000
 
+	// MaxPackagesPerUbuntuMappingRequest is a limit set in osv.dev's API, so is not configurable
+	MaxPackagesPerUbuntuMappingRequest = 1000
+
 	DefaultBaseURL = "https://api.osv.dev"
 )
 
@@ -183,6 +189,71 @@ func (c *OSVClient) ExperimentalDetermineVersion(ctx context.Context, query *api
 	return &result, nil
 }
 
+// ExperimentalQueryUbuntuPackageMapping is an interface to the experimental
+// /v1experimental/ubuntu/binary-to-source endpoint:
+// https://google.github.io/osv.dev/post-v1-ubuntu-binary-to-source/
+//
+// If more than MaxPackagesPerUbuntuMappingRequest binary names are provided,
+// requests are automatically chunked and executed concurrently.
+func (c *OSVClient) ExperimentalQueryUbuntuPackageMapping(
+	ctx context.Context,
+	params *api.UbuntuPackageMappingParameters,
+) (*api.UbuntuPackageMappingResponse, error) {
+	if params == nil {
+		return nil, errors.New("params cannot be nil")
+	}
+
+	if len(params.GetBinaryNames()) <= MaxPackagesPerUbuntuMappingRequest {
+		var result api.UbuntuPackageMappingResponse
+		if err := c.makeRequest(ctx, UbuntuBinaryToSourceEndpoint, params, &result); err != nil {
+			return nil, err
+		}
+
+		return &result, nil
+	}
+
+	nameChunks := chunkBy(params.GetBinaryNames(), MaxPackagesPerUbuntuMappingRequest)
+	batchedResults := make([][]*api.SourcePackages, len(nameChunks))
+
+	g, errGrpCtx := errgroup.WithContext(ctx)
+	if c.Config.MaxConcurrentBatchRequests > 0 {
+		g.SetLimit(c.Config.MaxConcurrentBatchRequests)
+	}
+	for batchIndex, chunk := range nameChunks {
+		g.Go(func() error {
+			if errGrpCtx.Err() != nil {
+				return errGrpCtx.Err()
+			}
+
+			var chunkResp api.UbuntuPackageMappingResponse
+			err := c.makeRequest(errGrpCtx, UbuntuBinaryToSourceEndpoint, &api.UbuntuPackageMappingParameters{
+				Ecosystem:   params.GetEcosystem(),
+				BinaryNames: chunk,
+			}, &chunkResp)
+			if err != nil {
+				return err
+			}
+
+			batchedResults[batchIndex] = chunkResp.GetResults()
+
+			return nil
+		})
+	}
+
+	if err := g.Wait(); err != nil {
+		return nil, err
+	}
+
+	totalResp := &api.UbuntuPackageMappingResponse{
+		Results: make([]*api.SourcePackages, 0, len(params.GetBinaryNames())),
+	}
+	for _, batch := range batchedResults {
+		totalResp.Results = append(totalResp.Results, batch...)
+	}
+
+	return totalResp, nil
+}
+
 func (c *OSVClient) makeRequest(ctx context.Context, endpoint string, reqBody, resBody proto.Message) error {
 	requestBytes, err := protojson.Marshal(reqBody)
 	if err != nil {
diff --git a/bindings/go/osvdev/osvdev_test.go b/bindings/go/osvdev/osvdev_test.go
index e74b8977dde..f7b700ddc7a 100644
--- a/bindings/go/osvdev/osvdev_test.go
+++ b/bindings/go/osvdev/osvdev_test.go
@@ -2,6 +2,11 @@ package osvdev_test
 
 import (
 	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -9,6 +14,8 @@ import (
 	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/ossf/osv-schema/bindings/go/osvconstants"
 	"github.com/ossf/osv-schema/bindings/go/osvschema"
+	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/testing/protocmp"
 	"osv.dev/bindings/go/api"
 	"osv.dev/bindings/go/internal/testhelper"
 	"osv.dev/bindings/go/osvdev"
@@ -445,3 +452,163 @@ func TestOSVClient_ExperimentalDetermineVersion(t *testing.T) {
 		})
 	}
 }
+
+func TestOSVClient_ExperimentalQueryUbuntuPackageMapping(t *testing.T) {
+	t.Parallel()
+
+	var chunkedRequests atomic.Int32
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != osvdev.UbuntuBinaryToSourceEndpoint {
+			http.Error(w, "unexpected path", http.StatusNotFound)
+			return
+		}
+		if r.Method != http.MethodPost {
+			http.Error(w, "unexpected method", http.StatusMethodNotAllowed)
+			return
+		}
+
+		body, err := io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		var params api.UbuntuPackageMappingParameters
+		if err := protojson.Unmarshal(body, &params); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		if params.GetEcosystem() == "" {
+			w.WriteHeader(http.StatusBadRequest)
+			_, _ = w.Write([]byte(`{"code":3,"message":"ecosystem is required"}`))
+
+			return
+		}
+		if len(params.GetBinaryNames()) > osvdev.MaxPackagesPerUbuntuMappingRequest {
+			w.WriteHeader(http.StatusBadRequest)
+			_, _ = w.Write([]byte(`{"code":3,"message":"too many binary_names"}`))
+
+			return
+		}
+		if params.GetEcosystem() == "Ubuntu:22.04" {
+			chunkedRequests.Add(1)
+		}
+
+		resp := &api.UbuntuPackageMappingResponse{
+			Results: make([]*api.SourcePackages, len(params.GetBinaryNames())),
+		}
+		for i, bin := range params.GetBinaryNames() {
+			if bin == "unknown" {
+				resp.Results[i] = &api.SourcePackages{}
+			} else {
+				resp.Results[i] = &api.SourcePackages{
+					SourceNames: []string{"src-" + bin},
+				}
+			}
+		}
+
+		out, err := protojson.Marshal(resp)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write(out)
+	}))
+	t.Cleanup(server.Close)
+
+	t.Run("single batch request", func(t *testing.T) {
+		t.Parallel()
+
+		c := osvdev.DefaultClient()
+		c.BaseHostURL = server.URL
+
+		got, err := c.ExperimentalQueryUbuntuPackageMapping(context.Background(), &api.UbuntuPackageMappingParameters{
+			Ecosystem:   "Ubuntu:24.04:LTS",
+			BinaryNames: []string{"libcurl4", "unknown"},
+		})
+		if err != nil {
+			t.Fatalf("ExperimentalQueryUbuntuPackageMapping failed: %v", err)
+		}
+
+		want := &api.UbuntuPackageMappingResponse{
+			Results: []*api.SourcePackages{
+				{SourceNames: []string{"src-libcurl4"}},
+				{},
+			},
+		}
+		if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" {
+			t.Errorf("ExperimentalQueryUbuntuPackageMapping mismatch (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("automatic chunking over 1000 packages", func(t *testing.T) {
+		t.Parallel()
+
+		c := osvdev.DefaultClient()
+		c.BaseHostURL = server.URL
+
+		const total = 1250
+		binaryNames := make([]string, total)
+		wantResults := make([]*api.SourcePackages, total)
+		for i := range total {
+			name := fmt.Sprintf("pkg-%d", i)
+			binaryNames[i] = name
+			wantResults[i] = &api.SourcePackages{
+				SourceNames: []string{"src-" + name},
+			}
+		}
+
+		got, err := c.ExperimentalQueryUbuntuPackageMapping(context.Background(), &api.UbuntuPackageMappingParameters{
+			Ecosystem:   "Ubuntu:22.04",
+			BinaryNames: binaryNames,
+		})
+		if err != nil {
+			t.Fatalf("ExperimentalQueryUbuntuPackageMapping chunked failed: %v", err)
+		}
+		if gotReqs := chunkedRequests.Load(); gotReqs != 2 {
+			t.Errorf("expected 2 chunked requests for %d packages, got %d", total, gotReqs)
+		}
+
+		want := &api.UbuntuPackageMappingResponse{
+			Results: wantResults,
+		}
+		if diff := cmp.Diff(want, got, protocmp.Transform()); diff != "" {
+			t.Errorf("ExperimentalQueryUbuntuPackageMapping chunked mismatch (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("nil params error", func(t *testing.T) {
+		t.Parallel()
+
+		c := osvdev.DefaultClient()
+		c.BaseHostURL = server.URL
+
+		_, err := c.ExperimentalQueryUbuntuPackageMapping(context.Background(), nil)
+		wantErr := testhelper.ErrContainsStr{
+			Str: "params cannot be nil",
+		}
+		if diff := cmp.Diff(wantErr, err, cmpopts.EquateErrors()); diff != "" {
+			t.Errorf("Unexpected error (-want +got):\n%s", diff)
+		}
+	})
+
+	t.Run("invalid request error propagation", func(t *testing.T) {
+		t.Parallel()
+
+		c := osvdev.DefaultClient()
+		c.BaseHostURL = server.URL
+
+		_, err := c.ExperimentalQueryUbuntuPackageMapping(context.Background(), &api.UbuntuPackageMappingParameters{
+			BinaryNames: []string{"libcurl4"},
+		})
+		wantErr := testhelper.ErrContainsStr{
+			Str: `client error: status="400 Bad Request" body={"code":3,"message":"ecosystem is required"}`,
+		}
+		if diff := cmp.Diff(wantErr, err, cmpopts.EquateErrors()); diff != "" {
+			t.Errorf("Unexpected error (-want +got):\n%s", diff)
+		}
+	})
+}