Boulder River (New Zealand)

{{Infobox river

| name = Boulder River

| image =

| image_size =

| image_caption =

| map = {{Maplink|frame=yes|type=line|plain=yes|zoom=10|frame-align=center|frame-width=270|frame-height=270|stroke-color=#0000ff|stroke-width=2}}

| map_size =

| map_caption = Route of the Boulder River

| map_alt =

| pushpin_map = New Zealand#New Zealand South Island

| pushpin_map_size = 270px

| pushpin_map_caption = Mouth of the Boulder River

| pushpin_map_alt =

| source1_location = Boulder Lake

| source1_coordinates = {{coord|-40.8893|172.575|format=dms|display=inline}}

| source1_elevation = {{convert|985|m}}

| mouth_location = Aorere River

| mouth_elevation =

| mouth_coordinates = {{coord|-40.80244|172.54875|format=dms|display=inline,title}}

| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| length =

| discharge1_avg =

| basin_size =

| progression = Boulder River → Aorere River → Ruataniwha Inlet → Golden Bay / Mohua → Tasman Sea

| tributaries_left = Amphitheatre Creek

| tributaries_right = Parson Creek

| waterfalls =

| bridges =

}}

The Boulder River is a small river in the north of the South Island of New Zealand.

The headwaters are at the Kahurangi National Park's small Boulder Lake. The river flows north for {{convert|10|km|mi|0}} before draining into the Aorere River.