diff --git a/src/components/material/ReceivingManagement/ReceivingDetail.tsx b/src/components/material/ReceivingManagement/ReceivingDetail.tsx
index 5fec58a9..d88cda44 100644
--- a/src/components/material/ReceivingManagement/ReceivingDetail.tsx
+++ b/src/components/material/ReceivingManagement/ReceivingDetail.tsx
@@ -90,23 +90,33 @@ export function ReceivingDetail({ id, mode = 'view' }: Props) {
   // 수입검사 성적서 모달 상태
   const [isInspectionModalOpen, setIsInspectionModalOpen] = useState(false);
 
-  // 품목/발주처 검색 옵션
+  // 품목/발주처 검색 옵션 및 로딩 상태
   const [itemOptions, setItemOptions] = useState<SearchableSelectOption[]>([]);
   const [supplierOptions, setSupplierOptions] = useState<SearchableSelectOption[]>([]);
+  const [isItemSearching, setIsItemSearching] = useState(false);
+  const [isSupplierSearching, setIsSupplierSearching] = useState(false);
 
-  // 품목/발주처 옵션 초기 로드
-  useEffect(() => {
-    if (!isNewMode && !isEditMode) return;
-    const loadOptions = async () => {
-      const [itemsResult, suppliersResult] = await Promise.all([
-        searchItems(),
-        searchSuppliers(),
-      ]);
-      if (itemsResult.success) setItemOptions(itemsResult.data);
-      if (suppliersResult.success) setSupplierOptions(suppliersResult.data);
-    };
-    loadOptions();
-  }, [isNewMode, isEditMode]);
+  // 품목 검색 핸들러
+  const handleItemSearch = useCallback(async (query: string) => {
+    setIsItemSearching(true);
+    try {
+      const result = await searchItems(query);
+      if (result.success) setItemOptions(result.data);
+    } finally {
+      setIsItemSearching(false);
+    }
+  }, []);
+
+  // 발주처 검색 핸들러
+  const handleSupplierSearch = useCallback(async (query: string) => {
+    setIsSupplierSearching(true);
+    try {
+      const result = await searchSuppliers(query);
+      if (result.success) setSupplierOptions(result.data);
+    } finally {
+      setIsSupplierSearching(false);
+    }
+  }, []);
 
   // API 데이터 로드
   const loadData = useCallback(async () => {
@@ -322,6 +332,8 @@ export function ReceivingDetail({ id, mode = 'view' }: Props) {
                         unit: found?.unit ?? prev.unit ?? 'EA',
                       }));
                     }}
+                    onSearch={handleItemSearch}
+                    isLoading={isItemSearching}
                     placeholder="품목코드 검색 및 선택"
                     searchPlaceholder="품목코드 또는 품목명 검색..."
                     emptyText="검색 결과가 없습니다"
@@ -348,6 +360,8 @@ export function ReceivingDetail({ id, mode = 'view' }: Props) {
                     options={supplierOptions}
                     value={formData.supplier || ''}
                     onChange={(value) => handleInputChange('supplier', value)}
+                    onSearch={handleSupplierSearch}
+                    isLoading={isSupplierSearching}
                     placeholder="발주처 검색 및 선택"
                     searchPlaceholder="발주처명 검색..."
                     emptyText="검색 결과가 없습니다"
diff --git a/src/components/ui/searchable-select.tsx b/src/components/ui/searchable-select.tsx
index 4d48e815..ff62b821 100644
--- a/src/components/ui/searchable-select.tsx
+++ b/src/components/ui/searchable-select.tsx
@@ -6,10 +6,12 @@
  * Popover + Command 패턴으로 구현
  * - 검색 가능하지만 직접 입력은 불가 (선택만 허용)
  * - 선택 후 Popover 자동 닫힘
+ * - 서버 검색 모드: onSearch 콜백으로 API 연동 (디바운스 300ms)
+ * - 최소 입력 조건: 한글 1자(완성형) / 영문 2자
  */
 
 import * as React from 'react';
-import { Check, ChevronsUpDown, Search } from 'lucide-react';
+import { Check, ChevronsUpDown, Loader2 } from 'lucide-react';
 import { cn } from './utils';
 import { Button } from './button';
 import { Popover, PopoverContent, PopoverTrigger } from './popover';
@@ -37,10 +39,31 @@ interface SearchableSelectProps {
   emptyText?: string;
   disabled?: boolean;
   className?: string;
-  /** 서버 검색 모드: 검색어 변경 시 호출 */
+  /** 서버 검색 모드: 검색어 변경 시 호출 (디바운스 적용) */
   onSearch?: (query: string) => void;
   /** 로딩 상태 */
   isLoading?: boolean;
+  /** 최소 입력 안내 메시지 */
+  minInputText?: string;
+}
+
+/**
+ * 검색어가 최소 입력 조건을 만족하는지 확인
+ * - 한글 완성형 1자 이상 또는 영문 2자 이상
+ */
+function isValidSearchQuery(query: string): boolean {
+  if (!query || !query.trim()) return false;
+  const trimmed = query.trim();
+  // 한글 완성형 1자 이상
+  const hasCompleteKorean = /[가-힣]/.test(trimmed);
+  if (hasCompleteKorean) return true;
+  // 영문 2자 이상
+  const englishChars = trimmed.replace(/[^a-zA-Z]/g, '');
+  if (englishChars.length >= 2) return true;
+  // 숫자+영문 조합 2자 이상
+  const alphanumeric = trimmed.replace(/[^a-zA-Z0-9]/g, '');
+  if (alphanumeric.length >= 2) return true;
+  return false;
 }
 
 export function SearchableSelect({
@@ -54,11 +77,15 @@ export function SearchableSelect({
   className,
   onSearch,
   isLoading = false,
+  minInputText = '한글 1자 또는 영문 2자 이상 입력하세요',
 }: SearchableSelectProps) {
   const [open, setOpen] = React.useState(false);
   const [searchQuery, setSearchQuery] = React.useState('');
+  const debounceRef = React.useRef<ReturnType<typeof setTimeout> | null>(null);
 
   const selectedOption = options.find((opt) => opt.value === value);
+  const isServerSearch = !!onSearch;
+  const queryValid = isValidSearchQuery(searchQuery);
 
   const handleSelect = (selectedValue: string) => {
     const option = options.find((opt) => opt.value === selectedValue);
@@ -71,7 +98,21 @@ export function SearchableSelect({
 
   const handleSearchChange = (query: string) => {
     setSearchQuery(query);
-    onSearch?.(query);
+
+    if (!isServerSearch) return;
+
+    // 디바운스 취소
+    if (debounceRef.current) {
+      clearTimeout(debounceRef.current);
+    }
+
+    // 최소 입력 조건 미충족 시 검색하지 않음
+    if (!isValidSearchQuery(query)) return;
+
+    // 디바운스 300ms
+    debounceRef.current = setTimeout(() => {
+      onSearch(query);
+    }, 300);
   };
 
   // Popover 닫힐 때 검색어 초기화
@@ -79,9 +120,33 @@ export function SearchableSelect({
     setOpen(isOpen);
     if (!isOpen) {
       setSearchQuery('');
+      if (debounceRef.current) {
+        clearTimeout(debounceRef.current);
+      }
     }
   };
 
+  // 클린업
+  React.useEffect(() => {
+    return () => {
+      if (debounceRef.current) {
+        clearTimeout(debounceRef.current);
+      }
+    };
+  }, []);
+
+  // 서버 검색 모드에서 안내 메시지 결정
+  const getEmptyMessage = () => {
+    if (isServerSearch) {
+      if (!searchQuery) return minInputText;
+      if (!queryValid) return minInputText;
+    }
+    return emptyText;
+  };
+
+  // 서버 검색 모드에서 검색어 미입력/미충족 시 옵션 숨김
+  const displayOptions = isServerSearch && !queryValid ? [] : options;
+
   return (
     <Popover open={open} onOpenChange={handleOpenChange}>
       <PopoverTrigger asChild>
@@ -103,7 +168,7 @@ export function SearchableSelect({
         </Button>
       </PopoverTrigger>
       <PopoverContent className="w-[--radix-popover-trigger-width] p-0" align="start">
-        <Command shouldFilter={!onSearch}>
+        <Command shouldFilter={!isServerSearch}>
           <CommandInput
             placeholder={searchPlaceholder}
             value={searchQuery}
@@ -112,14 +177,14 @@ export function SearchableSelect({
           <CommandList>
             {isLoading ? (
               <div className="flex items-center justify-center py-6 text-sm text-muted-foreground">
-                <Search className="mr-2 h-4 w-4 animate-pulse" />
+                <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                 검색 중...
               </div>
             ) : (
               <>
-                <CommandEmpty>{emptyText}</CommandEmpty>
+                <CommandEmpty>{getEmptyMessage()}</CommandEmpty>
                 <CommandGroup>
-                  {options.map((option) => (
+                  {displayOptions.map((option) => (
                     <CommandItem
                       key={option.value}
                       value={option.label}
@@ -150,4 +215,4 @@ export function SearchableSelect({
       </PopoverContent>
     </Popover>
   );
-}
\ No newline at end of file
+}