diff --git a/api/include/opentelemetry/baggage/baggage.h b/api/include/opentelemetry/baggage/baggage.h
index e3e08ff225..6e2354366c 100644
--- a/api/include/opentelemetry/baggage/baggage.h
+++ b/api/include/opentelemetry/baggage/baggage.h
@@ -121,7 +121,7 @@ class OPENTELEMETRY_EXPORT Baggage
     }
 
     nostd::shared_ptr<Baggage> baggage(new Baggage(cnt));
-    bool kv_valid;
+    bool kv_valid{false};
     nostd::string_view key, value;
 
     while (kv_str_tokenizer.next(kv_valid, key, value) && baggage->kv_properties_->Size() < cnt)
diff --git a/api/include/opentelemetry/trace/propagation/http_trace_context.h b/api/include/opentelemetry/trace/propagation/http_trace_context.h
index 81d4c308ec..76b94284ef 100644
--- a/api/include/opentelemetry/trace/propagation/http_trace_context.h
+++ b/api/include/opentelemetry/trace/propagation/http_trace_context.h
@@ -80,7 +80,7 @@ class HttpTraceContext : public context::propagation::TextMapPropagator
 
   static TraceFlags TraceFlagsFromHex(nostd::string_view trace_flags)
   {
-    uint8_t flags;
+    uint8_t flags{0};
     detail::HexToBinary(trace_flags, &flags, sizeof(flags));
     return TraceFlags(flags);
   }
@@ -140,7 +140,7 @@ class HttpTraceContext : public context::propagation::TextMapPropagator
     }
 
     // hex is valid, convert it to binary
-    uint8_t version_binary;
+    uint8_t version_binary{kInvalidVersion};
     detail::HexToBinary(version_hex, &version_binary, sizeof(version_binary));
     if (version_binary == kInvalidVersion)
     {
diff --git a/api/include/opentelemetry/trace/propagation/jaeger.h b/api/include/opentelemetry/trace/propagation/jaeger.h
index 45a9370919..ac843f97b6 100644
--- a/api/include/opentelemetry/trace/propagation/jaeger.h
+++ b/api/include/opentelemetry/trace/propagation/jaeger.h
@@ -112,7 +112,7 @@ class JaegerPropagator : public context::propagation::TextMapPropagator
       return SpanContext::GetInvalid();
     }
 
-    uint8_t flags;
+    uint8_t flags{0};
     if (!detail::HexToBinary(flags_hex, &flags, sizeof(flags)))
     {
       return SpanContext::GetInvalid();
diff --git a/api/include/opentelemetry/trace/trace_state.h b/api/include/opentelemetry/trace/trace_state.h
index df7a0e0fe9..7ed83284cb 100644
--- a/api/include/opentelemetry/trace/trace_state.h
+++ b/api/include/opentelemetry/trace/trace_state.h
@@ -64,7 +64,7 @@ class OPENTELEMETRY_EXPORT TraceState
     }
 
     nostd::shared_ptr<TraceState> ts(new TraceState(cnt));
-    bool kv_valid;
+    bool kv_valid{false};
     nostd::string_view key, value;
     while (kv_str_tokenizer.next(kv_valid, key, value) && ts->kv_properties_->Size() < cnt)
     {
diff --git a/sdk/include/opentelemetry/sdk/metrics/view/view_registry.h b/sdk/include/opentelemetry/sdk/metrics/view/view_registry.h
index e4d25ec3e7..4cc8711323 100644
--- a/sdk/include/opentelemetry/sdk/metrics/view/view_registry.h
+++ b/sdk/include/opentelemetry/sdk/metrics/view/view_registry.h
@@ -68,7 +68,7 @@ class ViewRegistry
 
       if (aggregation_type == AggregationType::kDefault)
       {
-        bool is_monotonic;
+        bool is_monotonic{false};
         aggregation_type = DefaultAggregation::GetDefaultAggregationType(
             instrument_selector->GetInstrumentType(), is_monotonic);
       }
diff --git a/sdk/test/configuration/yaml_distribution_test.cc b/sdk/test/configuration/yaml_distribution_test.cc
index 4b1e7ebf86..9ba73c43dc 100644
--- a/sdk/test/configuration/yaml_distribution_test.cc
+++ b/sdk/test/configuration/yaml_distribution_test.cc
@@ -67,7 +67,7 @@ file_format: "1.0-distribution"
   auto *distribution = config->distribution.get();
   ASSERT_NE(distribution, nullptr);
   ASSERT_EQ(distribution->entries.size(), 2);
-  opentelemetry::sdk::configuration::DocumentNode *node;
+  opentelemetry::sdk::configuration::DocumentNode *node{nullptr};
   std::unique_ptr<opentelemetry::sdk::configuration::DocumentNode> property;
   std::string name;