diff --git a/.github/workflows/build-crates-individually.yml b/.github/workflows/build-crates-individually.yml
index 57b25707..8dd84409 100644
--- a/.github/workflows/build-crates-individually.yml
+++ b/.github/workflows/build-crates-individually.yml
@@ -1,5 +1,12 @@
 name: Build crates individually
 
+# Ensures that only one workflow task will run at a time. Previous builds, if
+# already in process, will get cancelled. Only the latest commit will be allowed
+# to run, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
   push:
diff --git a/.github/workflows/continous-delivery.yml b/.github/workflows/continous-delivery.yml
index 3b14683c..7414e8d3 100644
--- a/.github/workflows/continous-delivery.yml
+++ b/.github/workflows/continous-delivery.yml
@@ -1,5 +1,12 @@
 name: CD
 
+# Ensures that only one workflow task will run at a time. Previous deployments, if
+# already in process, won't get cancelled. Instead, we let the first to complete
+# then queue the latest pending workflow, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 on:
   workflow_dispatch:
     inputs:
diff --git a/.github/workflows/continous-integration-docker.yml b/.github/workflows/continous-integration-docker.yml
index 6fc73bf7..df965681 100644
--- a/.github/workflows/continous-integration-docker.yml
+++ b/.github/workflows/continous-integration-docker.yml
@@ -1,5 +1,12 @@
 name: CI Docker
 
+# Ensures that only one workflow task will run at a time. Previous builds, if
+# already in process, will get cancelled. Only the latest commit will be allowed
+# to run, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
     inputs:
@@ -312,6 +319,14 @@ jobs:
       saves_to_disk: true
       disk_suffix: tip
       height_grep_text: 'current_height.*=.*Height'
+    # We don't want to cancel running full syncs on `main` if a new PR gets merged,
+    # because we might never finish a full sync during busy weeks. Instead, we let the
+    # first sync complete, then queue the latest pending sync, cancelling any syncs in between.
+    # (As the general workflow concurrency group just gets matched in Pull Requests,
+    # it has no impact on this job.)
+    concurrency: 
+      group: github.workflow−{{ github.ref }}
+      cancel-in-progress: false
 
   # Test that Zebra can sync to the chain tip, using a cached Zebra tip state,
   # without launching `lightwalletd`.
diff --git a/.github/workflows/continous-integration-os.yml b/.github/workflows/continous-integration-os.yml
index 0bf90b8d..b89400f5 100644
--- a/.github/workflows/continous-integration-os.yml
+++ b/.github/workflows/continous-integration-os.yml
@@ -1,5 +1,12 @@
 name: CI OSes
 
+# Ensures that only one workflow task will run at a time. Previous builds, if
+# already in process, will get cancelled. Only the latest commit will be allowed
+# to run, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
   # we build Rust and Zcash parameter caches on main,
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 230afd68..b0e8ebea 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -1,5 +1,12 @@
 name: Coverage
 
+# Ensures that only one workflow task will run at a time. Previous builds, if
+# already in process, will get cancelled. Only the latest commit will be allowed
+# to run, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   workflow_dispatch:
   push:
diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index ddff8841..c797c92e 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -1,5 +1,12 @@
 name: Docs
 
+# Ensures that only one workflow task will run at a time. Previous deployments, if
+# already in process, won't get cancelled. Instead, we let the first to complete
+# then queue the latest pending workflow, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 on:
   workflow_dispatch:
   push:
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 254fe14c..42e3484f 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,5 +1,12 @@
 name: Lint
 
+# Ensures that only one workflow task will run at a time. Previous builds, if
+# already in process, will get cancelled. Only the latest commit will be allowed
+# to run, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   # we build Rust caches on main, so they can be shared by all branches:
   # https://docs.github.com/en/actions/using-workflows/caching-dependencies-to-speed-up-workflows#restrictions-for-accessing-a-cache
diff --git a/.github/workflows/zcash-params.yml b/.github/workflows/zcash-params.yml
index b2f59fb0..e283c744 100644
--- a/.github/workflows/zcash-params.yml
+++ b/.github/workflows/zcash-params.yml
@@ -1,5 +1,12 @@
 name: zcash-params
 
+# Ensures that only one workflow task will run at a time. Previous deployments, if
+# already in process, won't get cancelled. Instead, we let the first to complete
+# then queue the latest pending workflow, cancelling any workflows in between
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: false
+
 on:
   workflow_dispatch:
   push: