2011 Rakuten Japan Open Tennis Championships

{{TennisEventInfo|2011|Rakuten Japan Open Tennis Championships|

| date=3–9 October

| edition=38th

| surface=Hard / outdoor

| location=Tokyo, Japan

| champs={{flagicon|GBR}} Andy Murray{{cite web|title=2011 Tokyo Men's Singles draw|url=http://www.atptour.com/en/scores/archive/tokyo/329/2011/draws?matchType=singles|publisher=Association of Tennis Professionals (ATP)}}

| champd={{flagicon|GBR}} Andy Murray / {{flagicon|GBR}} Jamie Murray{{cite web|title=2011 Tokyo Men's Doubles draw|url=http://www.atptour.com/en/scores/archive/tokyo/329/2011/draws?matchType=doubles|publisher=Association of Tennis Professionals (ATP)}}

| main_name=Japan Open (tennis) {{!}} Japan Open

}}

The 2011 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 38th edition of the event known that year as the Rakuten Japan Open Tennis Championships, and was part of the 500 Series of the 2011 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from 3 October through 9 October 2011. Andy Murray won both the singles and doubles titles, the latter with his brother Jamie.

Singles main-draw entrants

=Seeds=

class="sortable wikitable"
width="70"\| Country ! width="175"\| Player ! Rank¹ ! Seed
{{flag\|ESP}} \|Rafael Nadal \|2 \|1
{{flag\|GBR}} \|Andy Murray \|4 \|2
{{flag\|ESP}} \|David Ferrer \|5 \|3
{{flagu\|USA}} \|Mardy Fish \|8 \|4
{{flag\|SRB}} \|Viktor Troicki \|15 \|5
{{flag\|SRB}} \|Janko Tipsarević \|17 \|6
{{flag\|CZE}} \|Radek Štěpánek \|24 \|7
{{flag\|ARG}} \|Juan Mónaco \|27 \|8

class="sortable wikitable"

width="70"| Country

! width="175"| Player

! Rank¹

! Seed

|15