diff --git a/api/handler.go b/api/handler.go
index eb7e213..9a8df48 100644
--- a/api/handler.go
+++ b/api/handler.go
@@ -45,6 +45,7 @@ func Handler() *mux.Router {
 	m.Get(router.CreateObservationType).Handler(handler(serveCreateObservationType))
 	m.Get(router.ObservationTypes).Handler(handler(serveObservationTypeList))
 	m.Get(router.UpdateObservationType).Handler(handler(serveUpdateObservationType))
+	m.Get(router.DeleteObservationType).Handler(handler(serveDeleteObservationType))
 
 	return m
 }
diff --git a/api/observation_types.go b/api/observation_types.go
index cbf28c9..abdbc9f 100644
--- a/api/observation_types.go
+++ b/api/observation_types.go
@@ -76,3 +76,17 @@ func serveUpdateObservationType(w http.ResponseWriter, r *http.Request) error {
 
 	return writeJSON(w, observation_type)
 }
+
+func serveDeleteObservationType(w http.ResponseWriter, r *http.Request) error {
+	id, _ := strconv.ParseInt(mux.Vars(r)["Id"], 10, 0)
+
+	deleted, err := store.ObservationTypes.Delete(id)
+	if err != nil {
+		return err
+	}
+	if deleted {
+		w.WriteHeader(http.StatusOK)
+	}
+
+	return writeJSON(w, &models.ObservationType{})
+}
diff --git a/api/observation_types_test.go b/api/observation_types_test.go
index 4469695..62bc19b 100644
--- a/api/observation_types_test.go
+++ b/api/observation_types_test.go
@@ -124,3 +124,30 @@ func TestObservationType_Update(t *testing.T) {
 		t.Error("!success")
 	}
 }
+
+func TestObservationType_Delete(t *testing.T) {
+	setup()
+
+	want := newObservationType()
+
+	calledDelete := false
+	store.ObservationTypes.(*models.MockObservationTypesService).Delete_ = func(id int64) (bool, error) {
+		if id != want.Id {
+			t.Errorf("wanted request for observation_type %d but got %d", want.Id, id)
+		}
+		calledDelete = true
+		return true, nil
+	}
+
+	success, err := apiClient.ObservationTypes.Delete(want.Id)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !calledDelete {
+		t.Error("!calledDelete")
+	}
+	if !success {
+		t.Error("!success")
+	}
+}
diff --git a/datastore/observation_types.go b/datastore/observation_types.go
index 1bebeec..d4b08f9 100644
--- a/datastore/observation_types.go
+++ b/datastore/observation_types.go
@@ -69,3 +69,19 @@ func (s *observationTypesStore) Update(id int64, observation_type *models.Observ
 
 	return true, nil
 }
+
+func (s *observationTypesStore) Delete(id int64) (bool, error) {
+	observation_type, err := s.Get(id)
+	if err != nil {
+		return false, err
+	}
+
+	deleted, err := s.dbh.Delete(observation_type)
+	if err != nil {
+		return false, err
+	}
+	if deleted == 0 {
+		return false, ErrNoRowsDeleted
+	}
+	return true, nil
+}
diff --git a/datastore/observation_types_test.go b/datastore/observation_types_test.go
index 86b66c0..69dbf78 100644
--- a/datastore/observation_types_test.go
+++ b/datastore/observation_types_test.go
@@ -105,3 +105,22 @@ func TestObservationTypesStore_Update_db(t *testing.T) {
 		t.Error("!updated")
 	}
 }
+
+func TestObservationTypesStore_Delete_db(t *testing.T) {
+	tx, _ := DB.Begin()
+	defer tx.Rollback()
+
+	observation_type := insertObservationType(t, tx)
+
+	d := NewDatastore(tx)
+
+	// Delete it
+	deleted, err := d.ObservationTypes.Delete(observation_type.Id)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !deleted {
+		t.Error("!delete")
+	}
+}
diff --git a/models/observation_types.go b/models/observation_types.go
index a785a3a..ccbe10a 100644
--- a/models/observation_types.go
+++ b/models/observation_types.go
@@ -37,6 +37,9 @@ type ObservationTypesService interface {
 
 	// Update an existing observation type
 	Update(id int64, observation_type *ObservationType) (updated bool, err error)
+
+	// Delete an existing observation type
+	Delete(id int64) (deleted bool, err error)
 }
 
 var (
@@ -133,11 +136,34 @@ func (s *observationTypesService) Update(id int64, observation_type *Observation
 	return resp.StatusCode == http.StatusOK, nil
 }
 
+func (s *observationTypesService) Delete(id int64) (bool, error) {
+	strId := strconv.FormatInt(id, 10)
+
+	url, err := s.client.url(router.DeleteObservationType, map[string]string{"Id": strId}, nil)
+	if err != nil {
+		return false, err
+	}
+
+	req, err := s.client.NewRequest("DELETE", url.String(), nil)
+	if err != nil {
+		return false, err
+	}
+
+	var observation_type *ObservationType
+	resp, err := s.client.Do(req, &observation_type)
+	if err != nil {
+		return false, err
+	}
+
+	return resp.StatusCode == http.StatusOK, nil
+}
+
 type MockObservationTypesService struct {
 	Get_    func(id int64) (*ObservationType, error)
 	List_   func(opt *ObservationTypeListOptions) ([]*ObservationType, error)
 	Create_ func(observation_type *ObservationType) (bool, error)
 	Update_ func(id int64, observation_type *ObservationType) (bool, error)
+	Delete_ func(id int64) (bool, error)
 }
 
 var _ ObservationTypesService = &MockObservationTypesService{}
@@ -169,3 +195,10 @@ func (s *MockObservationTypesService) Update(id int64, observation_type *Observa
 	}
 	return s.Update_(id, observation_type)
 }
+
+func (s *MockObservationTypesService) Delete(id int64) (bool, error) {
+	if s.Delete_ == nil {
+		return false, nil
+	}
+	return s.Delete_(id)
+}
diff --git a/models/observation_types_test.go b/models/observation_types_test.go
index cf53cfb..2b16741 100644
--- a/models/observation_types_test.go
+++ b/models/observation_types_test.go
@@ -143,3 +143,32 @@ func TestObservationTypeService_Update(t *testing.T) {
 		t.Fatal("!called")
 	}
 }
+
+func TestObservationTypeService_Delete(t *testing.T) {
+	setup()
+	defer teardown()
+
+	want := newObservationType()
+
+	var called bool
+	mux.HandleFunc(urlPath(t, router.DeleteObservationType, map[string]string{"Id": "1"}), func(w http.ResponseWriter, r *http.Request) {
+		called = true
+		testMethod(t, r, "DELETE")
+
+		w.WriteHeader(http.StatusOK)
+		writeJSON(w, want)
+	})
+
+	deleted, err := client.ObservationTypes.Delete(want.Id)
+	if err != nil {
+		t.Errorf("ObservationTypes.Delete returned error: %v", err)
+	}
+
+	if !deleted {
+		t.Error("!deleted")
+	}
+
+	if !called {
+		t.Fatal("!called")
+	}
+}
diff --git a/router/api.go b/router/api.go
index a1bbf34..e3d5cb7 100644
--- a/router/api.go
+++ b/router/api.go
@@ -36,6 +36,7 @@ func API() *mux.Router {
 	m.Path("/observation_types").Methods("POST").Name(CreateObservationType)
 	m.Path("/observation_types/{Id:.+}").Methods("GET").Name(ObservationType)
 	m.Path("/observation_types/{Id:.+}").Methods("PUT").Name(UpdateObservationType)
+	m.Path("/observation_types/{Id:.+}").Methods("DELETE").Name(DeleteObservationType)
 
 	return m
 }
diff --git a/router/routes.go b/router/routes.go
index ca63317..7557d9a 100644
--- a/router/routes.go
+++ b/router/routes.go
@@ -27,4 +27,5 @@ const (
 	CreateObservationType = "observation_type:create"
 	ObservationTypes      = "observation_type:list"
 	UpdateObservationType = "observation_type:update"
+	DeleteObservationType = "observation_type:delete"
 )