diff --git a/src/core/iomgr/pollset_multipoller_with_epoll.c b/src/core/iomgr/pollset_multipoller_with_epoll.c
index b609e83c118..b22eaa62889 100644
--- a/src/core/iomgr/pollset_multipoller_with_epoll.c
+++ b/src/core/iomgr/pollset_multipoller_with_epoll.c
@@ -211,12 +211,12 @@ static void multipoll_with_epoll_pollset_maybe_work_and_unlock(
             /* TODO(klempner): We might want to consider making err and pri
              * separate events */
             int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP);
-            int read = ep_ev[i].events & (EPOLLIN | EPOLLPRI);
-            int write = ep_ev[i].events & EPOLLOUT;
-            if (read || cancel) {
+            int read_ev = ep_ev[i].events & (EPOLLIN | EPOLLPRI);
+            int write_ev = ep_ev[i].events & EPOLLOUT;
+            if (read_ev || cancel) {
               grpc_fd_become_readable(exec_ctx, fd);
             }
-            if (write || cancel) {
+            if (write_ev || cancel) {
               grpc_fd_become_writable(exec_ctx, fd);
             }
           }
diff --git a/src/core/iomgr/tcp_server_posix.c b/src/core/iomgr/tcp_server_posix.c
index a582f4a7c31..13bd67576f5 100644
--- a/src/core/iomgr/tcp_server_posix.c
+++ b/src/core/iomgr/tcp_server_posix.c
@@ -478,8 +478,8 @@ done:
   return allocated_port1 >= 0 ? allocated_port1 : allocated_port2;
 }
 
-int grpc_tcp_server_get_fd(grpc_tcp_server *s, unsigned index) {
-  return (index < s->nports) ? s->ports[index].fd : -1;
+int grpc_tcp_server_get_fd(grpc_tcp_server *s, unsigned port_index) {
+  return (port_index < s->nports) ? s->ports[port_index].fd : -1;
 }
 
 void grpc_tcp_server_start(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s,
diff --git a/src/core/iomgr/udp_server.c b/src/core/iomgr/udp_server.c
index d884359aa43..a8d611c3f2d 100644
--- a/src/core/iomgr/udp_server.c
+++ b/src/core/iomgr/udp_server.c
@@ -399,8 +399,8 @@ done:
   return allocated_port1 >= 0 ? allocated_port1 : allocated_port2;
 }
 
-int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned index) {
-  return (index < s->nports) ? s->ports[index].fd : -1;
+int grpc_udp_server_get_fd(grpc_udp_server *s, unsigned port_index) {
+  return (port_index < s->nports) ? s->ports[port_index].fd : -1;
 }
 
 void grpc_udp_server_start(grpc_exec_ctx *exec_ctx, grpc_udp_server *s,
diff --git a/src/core/support/time_posix.c b/src/core/support/time_posix.c
index eedfd0a0607..78f2c2bb77a 100644
--- a/src/core/support/time_posix.c
+++ b/src/core/support/time_posix.c
@@ -52,11 +52,11 @@ static struct timespec timespec_from_gpr(gpr_timespec gts) {
 
 #if _POSIX_TIMERS > 0
 static gpr_timespec gpr_from_timespec(struct timespec ts,
-                                      gpr_clock_type clock) {
+                                      gpr_clock_type clock_type) {
   gpr_timespec rv;
   rv.tv_sec = ts.tv_sec;
   rv.tv_nsec = (int)ts.tv_nsec;
-  rv.clock_type = clock;
+  rv.clock_type = clock_type;
   return rv;
 }
 
@@ -65,16 +65,16 @@ static clockid_t clockid_for_gpr_clock[] = {CLOCK_MONOTONIC, CLOCK_REALTIME};
 
 void gpr_time_init(void) {}
 
-gpr_timespec gpr_now(gpr_clock_type clock) {
+gpr_timespec gpr_now(gpr_clock_type clock_type) {
   struct timespec now;
-  GPR_ASSERT(clock != GPR_TIMESPAN);
-  if (clock == GPR_CLOCK_PRECISE) {
+  GPR_ASSERT(clock_type != GPR_TIMESPAN);
+  if (clock_type == GPR_CLOCK_PRECISE) {
     gpr_timespec ret;
     gpr_precise_clock_now(&ret);
     return ret;
   } else {
-    clock_gettime(clockid_for_gpr_clock[clock], &now);
-    return gpr_from_timespec(now, clock);
+    clock_gettime(clockid_for_gpr_clock[clock_type], &now);
+    return gpr_from_timespec(now, clock_type);
   }
 }
 #else
diff --git a/src/core/transport/chttp2/hpack_table.c b/src/core/transport/chttp2/hpack_table.c
index d5cb752789f..c442c2c3413 100644
--- a/src/core/transport/chttp2/hpack_table.c
+++ b/src/core/transport/chttp2/hpack_table.c
@@ -193,15 +193,15 @@ void grpc_chttp2_hptbl_destroy(grpc_chttp2_hptbl *tbl) {
 }
 
 grpc_mdelem *grpc_chttp2_hptbl_lookup(const grpc_chttp2_hptbl *tbl,
-                                      gpr_uint32 index) {
+                                      gpr_uint32 tbl_index) {
   /* Static table comes first, just return an entry from it */
-  if (index <= GRPC_CHTTP2_LAST_STATIC_ENTRY) {
-    return tbl->static_ents[index - 1];
+  if (tbl_index <= GRPC_CHTTP2_LAST_STATIC_ENTRY) {
+    return tbl->static_ents[tbl_index - 1];
   }
   /* Otherwise, find the value in the list of valid entries */
-  index -= (GRPC_CHTTP2_LAST_STATIC_ENTRY + 1);
-  if (index < tbl->num_ents) {
-    gpr_uint32 offset = (tbl->num_ents - 1u - index + tbl->first_ent) %
+  tbl_index -= (GRPC_CHTTP2_LAST_STATIC_ENTRY + 1);
+  if (tbl_index < tbl->num_ents) {
+    gpr_uint32 offset = (tbl->num_ents - 1u - tbl_index + tbl->first_ent) %
                         GRPC_CHTTP2_MAX_TABLE_COUNT;
     return tbl->ents[offset];
   }
diff --git a/src/core/transport/chttp2/stream_encoder.c b/src/core/transport/chttp2/stream_encoder.c
index b1f1db05d26..ec97af3d5dd 100644
--- a/src/core/transport/chttp2/stream_encoder.c
+++ b/src/core/transport/chttp2/stream_encoder.c
@@ -274,10 +274,11 @@ static grpc_mdelem *add_elem(grpc_chttp2_hpack_compressor *c,
   return elem_to_unref;
 }
 
-static void emit_indexed(grpc_chttp2_hpack_compressor *c, gpr_uint32 index,
+static void emit_indexed(grpc_chttp2_hpack_compressor *c, gpr_uint32 elem_index,
                          framer_state *st) {
-  gpr_uint32 len = GRPC_CHTTP2_VARINT_LENGTH(index, 1);
-  GRPC_CHTTP2_WRITE_VARINT(index, 1, 0x80, add_tiny_header_data(st, len), len);
+  gpr_uint32 len = GRPC_CHTTP2_VARINT_LENGTH(elem_index, 1);
+  GRPC_CHTTP2_WRITE_VARINT(elem_index, 1, 0x80, add_tiny_header_data(st, len),
+			   len);
 }
 
 static gpr_slice get_wire_value(grpc_mdelem *elem, gpr_uint8 *huffman_prefix) {
@@ -363,9 +364,10 @@ static void emit_lithdr_noidx_v(grpc_chttp2_hpack_compressor *c,
   add_header_data(st, gpr_slice_ref(value_slice));
 }
 
-static gpr_uint32 dynidx(grpc_chttp2_hpack_compressor *c, gpr_uint32 index) {
+static gpr_uint32 dynidx(grpc_chttp2_hpack_compressor *c,
+			 gpr_uint32 elem_index) {
   return 1 + GRPC_CHTTP2_LAST_STATIC_ENTRY + c->tail_remote_index +
-         c->table_elems - index;
+         c->table_elems - elem_index;
 }
 
 /* encode an mdelem; returns metadata element to unref */
diff --git a/src/core/transport/stream_op.c b/src/core/transport/stream_op.c
index 038586d48e2..1cb2bd7c598 100644
--- a/src/core/transport/stream_op.c
+++ b/src/core/transport/stream_op.c
@@ -274,14 +274,14 @@ void grpc_metadata_batch_link_tail(grpc_metadata_batch *batch,
 }
 
 void grpc_metadata_batch_merge(grpc_metadata_batch *target,
-                               grpc_metadata_batch *add) {
+                               grpc_metadata_batch *to_add) {
   grpc_linked_mdelem *l;
   grpc_linked_mdelem *next;
-  for (l = add->list.head; l; l = next) {
+  for (l = to_add->list.head; l; l = next) {
     next = l->next;
     link_tail(&target->list, l);
   }
-  for (l = add->garbage.head; l; l = next) {
+  for (l = to_add->garbage.head; l; l = next) {
     next = l->next;
     link_tail(&target->garbage, l);
   }