diff --git a/docs/user/FlowVariables.md b/docs/user/FlowVariables.md
index 7a7c3e222b..efa579d686 100644
--- a/docs/user/FlowVariables.md
+++ b/docs/user/FlowVariables.md
@@ -273,6 +273,7 @@ configuration file.
 | <a name="SKIP_REPAIR_TIE_FANOUT"></a>SKIP_REPAIR_TIE_FANOUT| Skip repair_tie_fanout at floorplan step.| 0|
 | <a name="SKIP_REPORT_METRICS"></a>SKIP_REPORT_METRICS| If set to 1, then metrics, report_metrics does nothing. Useful to speed up builds.| 0|
 | <a name="SKIP_VT_SWAP"></a>SKIP_VT_SWAP| Do not perform VT swap to improve QoR (default: do VT swap).| |
+| <a name="SLANG_PLUGIN_PATH"></a>SLANG_PLUGIN_PATH| Path to the slang plugin for Yosys. This can be a full path to a custom-built plugin (e.g. for Bazel builds) or just the plugin name.| slang|
 | <a name="SLEW_MARGIN"></a>SLEW_MARGIN| Specifies a slew margin when fixing max slew violations. This option allows you to overfix.| |
 | <a name="SWAP_ARITH_OPERATORS"></a>SWAP_ARITH_OPERATORS| Improve timing QoR by swapping ALU and MULT arithmetic operators.| |
 | <a name="SYNTH_ARGS"></a>SYNTH_ARGS| Optional synthesis variables for yosys.| |
@@ -326,6 +327,7 @@ configuration file.
 - [PRE_SYNTH_TCL](#PRE_SYNTH_TCL)
 - [SDC_FILE](#SDC_FILE)
 - [SDC_GUT](#SDC_GUT)
+- [SLANG_PLUGIN_PATH](#SLANG_PLUGIN_PATH)
 - [SYNTH_ARGS](#SYNTH_ARGS)
 - [SYNTH_BLACKBOXES](#SYNTH_BLACKBOXES)
 - [SYNTH_CANONICALIZE_TCL](#SYNTH_CANONICALIZE_TCL)
diff --git a/flow/scripts/synth_preamble.tcl b/flow/scripts/synth_preamble.tcl
index 3edee2d454..af43512c0f 100644
--- a/flow/scripts/synth_preamble.tcl
+++ b/flow/scripts/synth_preamble.tcl
@@ -44,7 +44,7 @@ proc read_design_sources { } {
   }
 
   if { [env_var_equals SYNTH_HDL_FRONTEND slang] } {
-    plugin -i slang
+    plugin -i $::env(SLANG_PLUGIN_PATH)
 
     set slang_args [list \
       -D SYNTHESIS --keep-hierarchy --compat=vcs --ignore-assertions --top $::env(DESIGN_NAME) \
diff --git a/flow/scripts/variables.yaml b/flow/scripts/variables.yaml
index fdf068ba83..cf99a5fac5 100644
--- a/flow/scripts/variables.yaml
+++ b/flow/scripts/variables.yaml
@@ -238,6 +238,13 @@ SYNTH_HDL_FRONTEND:
     command.
   stages:
     - synth
+SLANG_PLUGIN_PATH:
+  description: >
+    Path to the slang plugin for Yosys. This can be a full path to a
+    custom-built plugin (e.g. for Bazel builds) or just the plugin name.
+  default: slang
+  stages:
+    - synth
 SYNTH_SLANG_ARGS:
   description: >
     Additional arguments passed to the slang frontend during synthesis.