1987 Japan Series

{{Infobox Japan Series

| image =

| caption =

| country = Japan

| year = 1987

| champion = Seibu Lions (4)

| champion_manager = Masaaki Mori

| champion_games = 71-45-14

| runnerup = Yomiuri Giants (2)

| runnerup_manager = Sadaharu Oh

| runnerup_games = 76-43-11

| date = October 25 – November 1

| MVP = Kimiyasu Kudoh (Seibu)

| FSA = Kazunori Shinozuka (Yomiuri)

| television =

| announcers =

| radio_network =

| radio_announcers =

| umpires =

}}

The {{baseball year|1987}} Japan Series was the 38th edition of Nippon Professional Baseball's postseason championship series. It matched the Central League champion Yomiuri Giants against the Pacific League champion Seibu Lions. The Lions came into the series as the defending champions, having won the 1986 Japan Series. This was the Giants' 24th appearance in the Japan Series and first since 1983. The Lions defeated the Giants, 4 games to 2, and won their second championship in a row and seventh overall.

It was the first year the 18-inning limit was implemented for championships.