The　mechanical　and　tribological　properties　of　polyetheretherketone　(PEEK)　composites　filled　with　CaCO3　whisker　in　various　content　of　0　similar　to　45%　(wt　pct)　were　investigated.　The　composite　specimens　were　prepared　by　compression　molding.　Tribological　testing　of　composites　in　dry　wear　mode　against　carbon　steel　ring　was　carried　out　on　a　MM200　block-on-ring　apparatus.　Data　on　neat　PEEK　were　also　included　for　comparison.　It　was　observed　that　inclusion　of　CaCO3　whisker　affected　the　most　mechanical　properties　and　the　friction　and　wear　in　a　beneficial　way.　With　an　increase　in　CaCO3　whisker　content,　friction　coefficient　continuously　decreased　but　the　trends　in　wear　performance　varied.　The　specific　wear　rate　showed　minima　as　1.28　x　10(-6)　mm(3)/Nm　for　15%　CaCO3　whisker　inclusion　followed　by　a　slow　increase　for　further　CaCO3　whisker　addition.　In　terms　of　friction　applications,　When　the　tribological　and　mechanical　properties　are　combined,　the　optimal　content　of　CaCO3　whisker　in　the　filled　PEEK　should　be　recommended　as　15%　to　20%.　Fairly　good　correlations　are　observed　in　friction　coefficient　vs　bending　modulus　and　wear　rate　vs　bending　strength,　confirming　that　the　bending　properties　prove　to　be　the　most　important　tribology　controlling　parameters　in　the　present　work.