diff --git a/process.go b/process.go
index 2b5e8ed..57e1b8b 100644
--- a/process.go
+++ b/process.go
@@ -16,6 +16,12 @@ type Process interface {
 	// PPid is the parent process ID for this process.
 	PPid() int
 
+	// Pgrp is the process group ID of the process
+	Pgrp() int
+
+	// Sid is the session ID of the process
+	Sid() int
+
 	// Executable name running this process. This is not a path to the
 	// executable.
 	Executable() string
diff --git a/process_darwin.go b/process_darwin.go
index 5ee87fb..8ce55ea 100644
--- a/process_darwin.go
+++ b/process_darwin.go
@@ -12,6 +12,8 @@ import (
 type DarwinProcess struct {
 	pid    int
 	ppid   int
+	pgrp   int
+	sid    int
 	binary string
 }
 
@@ -23,6 +25,14 @@ func (p *DarwinProcess) PPid() int {
 	return p.ppid
 }
 
+func (p *DarwinProcess) Pgrp() int {
+	return p.pgrp
+}
+
+func (p *DarwinProcess) Sid() int {
+	return p.sid
+}
+
 func (p *DarwinProcess) Executable() string {
 	return p.binary
 }
@@ -63,9 +73,13 @@ func processes() ([]Process, error) {
 
 	darwinProcs := make([]Process, len(procs))
 	for i, p := range procs {
+		pgid, _ := syscall.Getpgid(int(p.Pid))
+		sid, _ := syscall.Getsid(int(p.Pid))
 		darwinProcs[i] = &DarwinProcess{
 			pid:    int(p.Pid),
 			ppid:   int(p.PPid),
+			pgrp:   pgid,
+			sid:    sid,
 			binary: darwinCstring(p.Comm),
 		}
 	}
diff --git a/process_freebsd.go b/process_freebsd.go
index 130acbe..3fd712c 100644
--- a/process_freebsd.go
+++ b/process_freebsd.go
@@ -121,6 +121,14 @@ func (p *UnixProcess) PPid() int {
 	return p.ppid
 }
 
+func (p *UnixProcess) Pgrp() int {
+	return p.pgrp
+}
+
+func (p *UnixProcess) Sid() int {
+	return p.sid
+}
+
 func (p *UnixProcess) Executable() string {
 	return p.binary
 }
diff --git a/process_unix.go b/process_unix.go
index cd217a8..7e16c21 100644
--- a/process_unix.go
+++ b/process_unix.go
@@ -29,6 +29,14 @@ func (p *UnixProcess) PPid() int {
 	return p.ppid
 }
 
+func (p *UnixProcess) Pgrp() int {
+	return p.pgrp
+}
+
+func (p *UnixProcess) Sid() int {
+	return p.sid
+}
+
 func (p *UnixProcess) Executable() string {
 	return p.binary
 }
diff --git a/process_windows.go b/process_windows.go
index f151974..99c58ab 100644
--- a/process_windows.go
+++ b/process_windows.go
@@ -42,6 +42,8 @@ type PROCESSENTRY32 struct {
 type WindowsProcess struct {
 	pid  int
 	ppid int
+	pgrp int
+	sid  int
 	exe  string
 }
 
@@ -53,6 +55,14 @@ func (p *WindowsProcess) PPid() int {
 	return p.ppid
 }
 
+func (p *WindowsProcess) Pgrp() int {
+	return p.pgrp
+}
+
+func (p *WindowsProcess) Sid() {
+	return p.sid
+}
+
 func (p *WindowsProcess) Executable() string {
 	return p.exe
 }