diff --git a/src/parallel/bbs.cpp b/src/parallel/bbs.cpp
index c27d2286e3..8650139585 100644
--- a/src/parallel/bbs.cpp
+++ b/src/parallel/bbs.cpp
@@ -262,8 +262,6 @@ void BBSImpl::execute(int id) {  // assumes a "_todo" message in receive buffer
     ++etaskcnt;
     double st, et;
     int userid;
-    char* s;
-    int i;
     int save_id = working_id_;
     int save_n = n_;
     working_id_ = id;
@@ -359,7 +357,7 @@ bool BBSImpl::working(int& id, double& x, int& userid) {
         }
         if (id != 0) {
             userid = upkint();
-            int wid = upkint();
+            /* int wid = */ upkint();
             rtype = upkint();
             if (rtype == 0) {
                 x = upkdouble();
diff --git a/src/parallel/bbsclimpi.cpp b/src/parallel/bbsclimpi.cpp
index 340b8cb3bc..ba5d78030d 100644
--- a/src/parallel/bbsclimpi.cpp
+++ b/src/parallel/bbsclimpi.cpp
@@ -211,7 +211,6 @@ bool BBSClient::look(const char* key) {
 }
 
 void BBSClient::take(const char* key) {  // blocking
-    int bufid;
     get(key, TAKE);
     upkbegin();
 }
@@ -300,9 +299,6 @@ void BBSClient::done() {
 }
 
 void BBSClient::start() {
-    char* client = 0;
-    int tid;
-    int n;
     if (started_) {
         return;
     }
diff --git a/src/parallel/bbslsrv.cpp b/src/parallel/bbslsrv.cpp
index 1d6092508c..b51255238e 100644
--- a/src/parallel/bbslsrv.cpp
+++ b/src/parallel/bbslsrv.cpp
@@ -126,7 +126,6 @@ int MessageValue::upkint(int* i) {
 }
 
 int MessageValue::upkdouble(double* d) {
-    const auto& mi = args_.front();
     if (const auto* val = std::get_if<double>(args_.data() + index_)) {
         *d = *val;
         ++index_;
@@ -136,7 +135,6 @@ int MessageValue::upkdouble(double* d) {
 }
 
 int MessageValue::upkvec(int n, double* d) {
-    const auto& mi = args_.front();
     if (const auto* val = std::get_if<std::vector<double>>(args_.data() + index_)) {
         for (std::size_t i = 0; i < n; ++i) {
             d[i] = val->at(i);
@@ -148,7 +146,6 @@ int MessageValue::upkvec(int n, double* d) {
 }
 
 int MessageValue::upkstr(char* s) {
-    const auto& mi = args_.front();
     if (const auto* val = std::get_if<std::string>(args_.data() + index_)) {
         for (std::size_t i = 0; i < val->size(); ++i) {
             s[i] = val->at(i);
@@ -161,7 +158,6 @@ int MessageValue::upkstr(char* s) {
 }
 
 int MessageValue::upkpickle(std::vector<char>& s) {
-    const auto& mi = args_.front();
     if (const auto* val = std::get_if<std::vector<char>>(args_.data() + index_)) {
         s = *val;
         ++index_;
@@ -225,7 +221,7 @@ bool BBSLocalServer::look(const char* key, MessageValue** val) {
 }
 
 void BBSLocalServer::post(const char* key, MessageValue* val) {
-    MessageList::iterator m = messages_->emplace(newstr(key), val);
+    messages_->emplace(newstr(key), val);
     Resource::ref(val);
 #if debug
     printf("srvr_post |%s|\n", key);
diff --git a/src/parallel/bbssrv2mpi.cpp b/src/parallel/bbssrv2mpi.cpp
index 1d2d4b6822..b07c9c5629 100644
--- a/src/parallel/bbssrv2mpi.cpp
+++ b/src/parallel/bbssrv2mpi.cpp
@@ -196,7 +196,7 @@ void BBSDirectServer::post(const char* key, bbsmpibuf* send) {
     if (take_pending(key, &cid)) {
         nrnmpi_bbssend(cid, TAKE, send);
     } else {
-        MessageList::iterator m = messages_->emplace(newstr(key), send);
+        messages_->emplace(newstr(key), send);
         nrnmpi_ref(send);
     }
 }
diff --git a/src/parallel/ocbbs.cpp b/src/parallel/ocbbs.cpp
index 2091a345e4..cafdb082cc 100644
--- a/src/parallel/ocbbs.cpp
+++ b/src/parallel/ocbbs.cpp
@@ -577,7 +577,6 @@ static double multisplit(void* v) {
     Section* sec = NULL;
     int sid = -1;
     int backbone_style = 2;
-    int reducedtree_host = 0;
     if (ifarg(1)) {
         nrn_seg_or_x_arg(1, &sec, &x);
         sid = (int) chkarg(2, 0, (double) (0x7fffffff));
@@ -1424,11 +1423,10 @@ void BBSImpl::return_args(int id) {
     // perhaps it would be better to do this directly
     // and avoid the meaningless create and delete.
     // but then they all would have to know this format
-    int i;
     char* s;
     // printf("BBSImpl::return_args(%d):\n", id);
-    i = upkint();  // userid
-    int wid = upkint();
+    upkint();  // userid
+    /* int wid = */ upkint();
     int style = upkint();
     // printf("message userid=%d style=%d\n", i, style);
     switch (style) {
@@ -1439,19 +1437,19 @@ void BBSImpl::return_args(int id) {
         break;
     case 2:            // obj first
         s = upkstr();  // template name
-        i = upkint();  // instance index
+        upkint();      // instance index
                        // printf("object %s[%d]\n", s, i);
         delete[] s;
         // fall through
     case 1:
         s = upkstr();  // fname
-        i = upkint();  // arg manifest
+        upkint();      // arg manifest
                        // printf("fname=|%s| manifest=%o\n", s, i);
         delete[] s;
         break;
     case 3:
         auto pickle = upkpickle();  // pickled callable
-        i = upkint();               // arg manifest
+        upkint();                   // arg manifest
         break;
     }
     // now only args are left and ready to unpack.